Classic cat and mouse moves.
Adblockers will move to OS level so google cant do anything about it.
Pi-hole and Network level blockers should also see a rise.
I think the same thing that happened with popup blockers will happen again. Advertisers will be forced to listen to the consumers and the internet will be better for it.
Have you turned off your popup blocker recently? You can surf around even to fairly sketchy sites, and I bet you won't see a pop up. The consumer won. With tracking, we'll win again.
A proxy that wants to do this before the browser will need to do a lot more work I think?
BTW I can see that you are French ^^