Behaviors classified as abusive by Google
https://www.bleepingcomputer.com/news/google/chrome-71-will-block-all-ads-on-abusive-sites-in-december/
Google has announced that starting in December 2018, Chrome 71 will remove all ads on sites that have repeatedly performed abusive behavior.
When Chrome 64 was released, Google introduced new features that blocked abusive advertising techniques such as tab-under behavior and malvertising redirects. Below you can see examples of deceptive video play buttons that lead to unwanted software or link clicks that open popup ads.