Comment by jfil

>one of the ways that Google Ads milks (scams?) unsophisticated buyers

The average advertiser has no clue about this. Google's role in the advertising ecosystem has been as a scammer and monopolist for many years now. Unfortunately, every major ad network learned from them, and they all have a similar trick default setting.

The latest scam from Google is PMAX, where you YOLO your placements/ad creative/landing page combos to Google and they optimize it automatically. This serves as an optimal mechanism to funnel your ads to the most fraudulent publishers, who's army of employees fills out your forms and bypasses bot protections most effectively. Google's team will then helpfully recommend to "ummm... maybe block their IPs?". Absolute racket.