This now appears under "Privacy and Messaging"
it's a sort of soft paywall where users get blocked from your site after X pageviews (configurable) unless they watch a video ad.
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support.google.com ]
Haven't tried yet but I suspect there will be a slight uptick in revenue and a massive boost in annoying your users. Google's MO in the last five years seems to be: "Yes, your revenue is getting worse but allow us to do X, Y and Z on your site and you can tread water and keep it the same."