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Google engineers want to make ad-blocking (near) impossible
(stackdiary.com)
This is a most excellent place for technology news and articles.
They can do this without this new API though. Many sites block users if they use ad blockers, have for years, and that's without this API.
Chrome isn't the only browser on mobiles. If Chrome doesn't let you block ads and you want to block ads, use a browser that does. Based on your logic, google would have eliminated ad blockers from Android overall already, yet they haven't.
The fact is that this new API doesn't block ad-blockers. Sites can already choose to block access if you have an ad blocker. There's no change.