More than 1/3 of the Top Publishers already adopted the ads.txt. We just analyse the top programmatic 100 domains in the world and we found out that 39% of the publishers already adopted the ads.txt, declaring the authorized digital sellers.
The adoption in English is 44%. In non English languages the adoption is only 24%. Even with the risk of domain spoofing, not all the publishers are adopting ads.txt. Now that DBM / Google is supporting ads.txt this can be an opportunity for publishers to kill domain spoofing and domain arbitrage.
See here the data in detail
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