Publicis tells clients to drop The Trade Desk after a failed audit; OpenAI tests an ads manager; Google's health AI handles a billion queries a day; Smartly bids for INCRMNTAL.
The week of March 16–22, 2026, delivered a concentrated burst of commercial pressure across three intersecting fronts: the slow-motion breakup between the world's largest holding companies and The Trade Desk, the maturation of OpenAI's advertising business from experiment to infrastructure, and a wave of platform-level changes across Google, Amazon, and the ad measurement stack that signal how automated and AI-native digital advertising has become in practice.
The biggest story in programmatic this week did not come from a product launch. It came from a leaked memo. Adweek reported on March 18 that Publicis, the French holding company that ranks among the world's largest advertising groups, sent a message to select clients advising them to stop working with The Trade Desk. The reason: the DSP failed an independent audit conducted by FirmDecisions, part of the Ebiquity Group.
The memo, obtained by Adweek, stated that The Trade Desk "improperly applied their DSP fee to other fees" charged to Publicis and some of its clients — for tools those clients were automatically opted into, without evidence of authorization. A second finding alleged that The Trade Desk "did not provide our auditor with the information necessary to validate that the media and data costs were invoiced at cost, without mark-up as per our agreement." The Trade Desk, for its part, flatly denied the characterization. "Any notion that TTD failed an audit is not true," a company spokesperson said. The company argued the auditor requested data that would violate confidentiality agreements with other customers, and said it "proposed a range of options to Publicis" as alternatives.
This dispute did not emerge from nowhere. Adweek had previously reported in February that Dentsu and WPP quietly exited The Trade Desk's OpenPath program, citing similar concerns about transparency and what they described as hidden fees. OpenPath, which is designed to let buyers purchase publisher inventory more directly and cheaply, was meant to be a supply-chain reform initiative. Three of the four largest holding companies have now distanced themselves from it or from The Trade Desk more broadly within the span of a month. That pattern is not coincidental.
The Publicis memo was addressed specifically to clients transacting through Publicis's Master Services Agreement with the DSP. Clients with independent relationships with The Trade Desk are unaffected by the recommendation, and the company retains relationships with other major holding companies. The Trade Desk said it is "committed to providing the highest level of industry transparency."
A column published by Adweek on March 20 framed the dispute not as a story about The Trade Desk specifically, but as a symptom of structural opacity baked into the entire supply chain. The piece noted that the holding company business model depends on undisclosed arrangements to survive on thin margins — and that a platform like The Trade Desk, which offers lower fees and direct paths to inventory, creates friction precisely because it disturbs those arrangements. MediaPost's Agency Daily reported on March 18 that ID Comms described the Publicis dispute as exposing broader industry issues, suggesting The Trade Desk "has questions to answer regarding its supply path and fee structure" but framing it also as a holding company conflict of interest.
Meanwhile, in the same week, Adweek reported on March 10 that The Trade Desk has been testing AI campaign creation using Anthropic's Claude. CEO Jeff Green, speaking at the Marketecture conference in New York on March 11, argued programmatic advertising is uniquely suited to AI automation: "We are looking at 20 million ad impression opportunities every single second, representing millions of ad campaigns and billions of users on the other side — and we have 10 milliseconds or less." The Publicis memo reached the market while The Trade Desk was simultaneously positioning itself as the open-internet infrastructure on which agentic AI buying will run. The contradiction is not lost on the industry.
OpenAI's advertising business has moved from vague announcement to functional infrastructure. Adweek reported on March 11 that the company has begun testing an Ads Manager with a small group of partners and is gathering feedback. An OpenAI spokesperson confirmed to Adweek that the Ads Manager is a dashboard that lets marketers run, monitor, and optimize campaigns in real time. Early testers currently receive weekly CSV reports containing performance data such as clicks and impressions.
The Ads Manager rollout arrives at a complicated moment. OpenAI had confirmed back in January 2026 that ads would appear at the bottom of ChatGPT responses when there is a relevant sponsored product or service tied to the ongoing conversation, visible to users on the Free and Go tiers in the United States. The platform set its minimum advertiser commitment at $200,000 and a CPM rate of $60 — well above typical Meta CPMs, which frequently fall below $20. Whether the premium holds will depend on OpenAI proving measurable results, and right now the evidence base is narrow.
Search Engine Roundtable's daily recap for March 19 noted that OpenAI continues to push its ads program forward, and that AdWeek had reported the Ads Manager testing over the weekend. The recap also noted that OpenAI's browser launch reinforces the company's trajectory toward becoming an ad-supported platform. A Digiday piece published March 19 traced the full arc of OpenAI's advertising path from CEO Sam Altman's public hostility toward advertising — calling it a "last resort" — through internal leaks of projected $1 billion in ad revenue for 2026, to the current state of operations.
The internal documents, when leaked, projected $1 billion in ad revenue for 2026 and $25 billion by 2029. For context, Amazon — now the third-largest digital advertising company globally — generated $56 billion in ad revenue last year with assets including the NBA, Prime Video, and a vast commerce data reservoir. OpenAI's path to comparable scale requires more than a functioning Ads Manager. It requires proof that LLM-referred traffic converts, and that advertisers trust the context enough to pay premium rates.
One data point that supports the case: PPC Land reported in early March on Criteo's entry as the first ad tech partner into OpenAI's ChatGPT pilot, citing Criteo's own internal data from a sample of 500 US retailers showing that LLM-referred users convert at approximately 1.5 times the rate of other referral channels. The sample is narrow — a single month, a subset of Criteo's roughly 17,000 advertiser clients — but the directional signal is what the industry is watching.
On March 17, Google hosted The Check Up 2026, its annual health showcase, where Hema Budaraju, who leads AI quality and experiences on Google Search, disclosed that Google processes over one billion health-related queries every single day. The scale is not hypothetical — it is the operational baseline against which Google is now deploying AI across search, wearables, clinical research, and genomic sequencing simultaneously.
The event, streamed live, included an announcement that Fitbit will integrate medical records before the end of April 2026, a 15% improvement in sleep accuracy, a $10 million Google.org fund for clinical education, a nationwide study of the AMIE diagnostic model with Included Health, a YouTube "Ask" button for health-related videos, and the release of DeepSomatic, a genomic variant calling model. AI Mode health features are now available across more than 200 countries and 90 languages. Roche sub-four-hour whole-genome sequencing at under $150 per sample was also disclosed at the event.
This is directly relevant to advertisers. Pharmaceutical companies, health insurers, medical device manufacturers, and consumer wellness brands have historically paid some of the highest CPMs in digital advertising. A platform that handles one billion health queries daily — and is now deploying AI Mode as a conversational search interface for those queries — is reshaping the economics of health advertising at scale. As PPC Land covered in March, this follows Amazon's March 10 expansion of its own Health AI agent from the One Medical app to Amazon.com and the Amazon Shopping app. Amazon's system is built on Amazon Bedrock as a multi-agent architecture, capable of booking appointments and explaining lab results, and is competing for the same conversational health query volume.
A Stanford study published earlier this year found that AI medical models produce severe clinical errors in 22% of cases across evaluated systems, with errors of omission — failing to recommend critical tests or treatments — accounting for 76.6% of the most harmful mistakes. That finding sits uneasily alongside the aggressive expansion of AI health tools at both Google and Amazon.
PPC Land reported on March 16 that Smartly, the New York-based AI advertising platform managing over $7 billion in global ad spend for more than 800 brands, signed a letter of intent on March 16 to acquire INCRMNTAL, a Tel Aviv-based marketing measurement company. The deal has not yet closed. INCRMNTAL was founded by Maor Sadra and Moti Tal and uses causal AI and reinforcement learning to quantify the incremental value of advertising spend without relying on user-level data or tracking. Roku cited the company as a measurement partner in its Q4 2025 earnings disclosures published in February.
The acquisition attempt fits a pattern of accelerating consolidation in measurement. From Smartly's perspective, the integration would embed always-on incrementality testing — which runs continuously rather than in episodic experiments — directly into its platform for planning and optimization across social, commerce, and CTV. French digital advertising trade group Alliance Digitale published a 57-page white paper in January 2026 recommending that marketers combine attribution and contribution approaches, including MMM, incrementality testing, and unified measurement. The guidance reflects a growing consensus: no single methodology provides a complete picture.
Roku's mention of INCRMNTAL in February earnings disclosures matters commercially. It suggests the platform's methodology is earning institutional credibility at the level where CTV platforms feel comfortable naming measurement partners publicly. INCRMNTAL employs between 11 and 50 people, making this an acqui-hire as much as a technology acquisition.
Google's advertising platform produced a concentrated sequence of changes in the seven days ending March 22, each of which alters how advertisers interact with the system. Taken together, they reflect the same theme: Google removing manual controls and replacing them with AI-managed signals.
The most operationally pressing was the Performance Max AI voice-over feature. PPC Land covered how Google began notifying advertisers in early March that Performance Max campaigns would automatically receive AI-generated voice-overs layered onto existing video ads using the headlines and descriptions in their asset groups. The feature was scheduled to activate automatically on March 20 for all accounts where video enhancement controls remained active. The opt-out required a campaign-level toggle — not a single account-wide switch — meaning advertisers managing large portfolios had to audit each campaign individually. Videos that already contained a voice track were excluded from the feature's scope.
The voice-over system generates a new video asset from the text, saves it alongside the original, and serves voice-enhanced versions in eligible placements. Google described the mechanism in the notification email as "straight forward in design but consequential in scope." Search Engine Roundtable noted on March 18 that Google also updated its Auto-Apply Recommendations interface, moving the button to just above the regular recommendations section, and that the Google Search Labs beaker icon on Android was replaced by an icon pushing users directly to AI Mode.
Also during the week, Search Engine Roundtable's March 17 update from Barry Schwartz documented that Google updated several advertising policies simultaneously — covering alcohol, prescription drugs, gambling, and government document services — with enforcement of the government documents policy beginning on March 17. For advertisers targeting India with Business Identifier ads, a new exemption applies, but certification requirements remain in place for restricted government services categories.
Google's Merchant Center for Agencies went live on March 11, giving digital marketing firms a single dashboard to oversee multiple client product accounts from a single login in the United States and Canada. The platform consolidates four functional areas: an agency overview page, a diagnostics page, a client optimization page, and an ads opportunities page. A pilot for agencies outside the US and Canada is running globally.
The Google NewFront, scheduled for March 23 — one day after this newsletter's publication date — will see Google present its "Gemini advantage in Google Marketing Platform." PPC Land reported on the event in late February, noting that Bill Reardon, General Manager of Enterprise Platform, announced the livestream (16:30–17:30 CET / 11:30 AM–12:30 PM ET) would focus on Display & Video 360's CTV capabilities and real-time data activation. Registration is required.
PPC Land's coverage of BuzzFeed on March 16 detailed how the company filed its Form 8-K with the SEC on March 12 announcing full-year 2025 results: revenue of $185.3 million, down 2.4% from 2024; net loss of $57.3 million including a $30.2 million non-cash goodwill impairment charge; and $60.2 million in total debt. The company disclosed going concern doubt and held just $8.5 million in unrestricted cash as of December 31, 2025. Of its $27.7 million in total cash, $15.8 million was restricted as collateral for office lease letters of credit.
The BuzzFeed situation matters for the advertising industry beyond its own balance sheet. The company participates in The Trade Desk's OpenAds auction platform as part of a nine-publisher first wave announced in January 2026 — positioning itself in more transparent, premium programmatic inventory environments even as it fights for liquidity. Its programmatic revenue runs across owned-and-operated properties plus YouTube and Apple News. That configuration — a publisher using automated optimization to reduce headcount dependence while burning cash — is the compressed version of the broader publisher economy's trajectory in 2026.
Digiday's March 17 ad tech briefing captured the broader context, noting that the emerging consensus from Q1's conference season is that few in the industry know where AI will land. At the Marketecture conference on March 11, Ari Paparo and other executives described the current period as comparable to earlier waves — desktop web, then mobile, then streaming. Madison & Wall's March 2026 updated forecast now projects 8.1% US advertising growth year over year, up from their previous estimate of 6.6%, driven by strong first-half performance. Geopolitical uncertainty — specifically the conflict in Iran — introduces what the firm described as "stagflationary potential" for the second half.
PPC Land reported on March 17 that Adobe and NVIDIA announced a strategic AI partnership on March 16 targeting next-generation Firefly models, 3D digital twins, agentic workflows, and enterprise content production. The deal connects NVIDIA's hardware and model infrastructure with Adobe's creative platform, with implications for agencies and brands that generate ad creative at scale through Adobe's tools.
The partnership is part of a structural shift in how creative assets are produced. Perion's 2025 Form 20-F, filed with the SEC on March 16, detailed how its Outmax AI execution agent drove CTV revenue up 59% in the fourth quarter and scaled one client's spend from $50,000 to $20 million over 24 months by operating as a cross-DSP optimization layer. The combination of AI-generated creative at the production layer (Adobe Firefly) and AI-managed execution at the media buying layer (Perion Outmax, or platforms like Smartly) represents the assembly of the automated advertising stack that the industry has been discussing for years.
Digiday's March 18 piece on Butler/Till reported that the agency's first agentic media buying tests cut both media and supply chain costs. The piece, published alongside a broader March 18 Digiday front page that also featured Instagram's "Shop the Look" AI controversy and an ad tech briefing dated March 17, reflects how agentic buying has moved from pilot-phase vocabulary to operational implementation across agencies.
PPC Land covered on March 15 Meta's March 13 announcement ending Nielsen's Designated Market Area targeting within its automotive model ads product, with a hard deadline of June 22, 2026. The replacement is Comscore Markets, a geographic targeting standard Meta introduced to its automotive advertising infrastructure in August 2025. Any campaign still relying on DMA codes after June 22 stops delivering.
The migration requires modifying catalog feed files to replace the dma_codes column with comscore_market_codes. Starting April 20, Meta will issue warnings during feed ingestion for Catalog Ads still containing DMA codes. The Business Help Centre comparison page between the two systems will itself be removed on June 22.
This change is the most operationally concrete of the automotive advertising transitions visible this week, but it sits within a longer arc of Nielsen's framework being phased out of parts of the digital advertising ecosystem — even as PPC Land reported on March 16 that A+E Global Media locked in a new multiyear Nielsen deal covering audience measurement and media intelligence across its linear and digital portfolio, including A&E, Lifetime, and The HISTORY Channel. The deal, announced on March 16 from New York, adds custom segmentation tools and automated buying infrastructure to Nielsen's existing relationship with A+E. The Nielsen 2026 upfront guide, published earlier in March, revealed that streaming now accounts for 66% of young adult television advertising time, with ad-supported viewing growing 9% quarter over quarter.
PPC Land's coverage on March 13 of JCDecaux's full-year 2025 results — released March 13 — documented a company generating its highest-ever free cash flow of €342.9 million while accelerating a programmatic transformation. Group revenue reached €3,967.1 million, with organic growth of +1.8% reported; strip out the Olympic and UEFA Euro distortion from 2024 and the underlying rate rises to +3.2%. Digital Out-of-Home now accounts for 41.7% of group revenue, up 2.7 percentage points year over year, growing +10.0% organically in 2025.
VIOOH, JCDecaux's programmatic SSP, is now connected to 57 DSPs across 35 countries. In March 2026, VIOOH announced a strategic partnership with OUTFRONT, bringing more than 7,600 digital screens and 18 billion monthly impressions to the platform — approximately 25% of the entire US DOOH market. That single deal materially expands the addressable programmatic DOOH inventory available to US buyers through a single SSP connection.
The DOOH trajectory matters because it is one of the few advertising categories growing in both programmatic infrastructure and physical footprint simultaneously. At 44.8% of total revenue in Q4 2025, DOOH is on track to cross the 50% threshold for JCDecaux within two years at current growth rates.
The March 2026 backdrop includes significant Google organic search volatility. Search Engine Roundtable's March 2026 Webmaster Report, published earlier in March, documented the first-ever Google Discover core update, which began on February 5 and completed on February 27 after three weeks. The update was designed to surface more locally relevant content, reduce sensational clickbait in Discover, and show more in-depth and timely content from sites with demonstrated expertise. Non-US publishers appearing in US Discover feeds were specifically targeted.
Alongside the Discover update, Search Engine Roundtable documented persistent, "heated" Google search ranking volatility throughout March. The March 2026 Google Webmaster Report noted the volatility but also reported that Google had no public comment to offer on the topic. For performance advertisers, the context matters: organic volatility tends to increase dependence on paid channels as publishers and brands scramble to maintain traffic. That dynamic runs in parallel to the broader structural shift documented by Similarweb data — showing that in several verticals, paid search click share nearly doubled between January 2025 and January 2026 as AI Overviews absorbed organic clicks.