Google AdSense limits the vignettes to once per hour and per site
Google this month introduced a new limitation on the vignettes. Users will only see this ad format once per hour, and per site.
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Before, vignettes were only shown to users between page loads within the same site, but Google will start showing vignettes to users who are between page loads when they navigate to a different site.
Vignette ads is an ad format from Google Adsense. Vignette ads are mobile full-screen ads that appear between page loads and can be skipped by users. Google says vignette ads are displayed when the user leaves a page, rather than when they arrive on one, so the user doesn’t have to wait for them to load.