Not just that but also risk a big fine; "regular" GDPR violations (when warnings are ignored) can be tens of millions, anti-trust fines can be half a billion easily. The EU compensates for tax loopholes via big fines.

The best way to communicate "stop doing stupid shit" to google is not use their services/applications when they do stupid shit. Losing market share/customers is far more impactful than any (currently possible) fines.

It is still anti competitive, a browser that has special rules/code for the browser maker websites. Next they could give their own websites permissions that other websites don't have by default and that you could not remove(or need to find a convoluted way to remove), ex they could give google webpages permissions to access your webcam and microphone by default.

This illegal things needs to be stopped it is not enough that only the people that understand it stop using Chrome.

That has already been done with video auto play.

Since GDPR is in percentage of turnover, how much market share/customers would Google have to loose to equal 1% fine (1% is less than what they should get for this)?

If you can answer that question, and then suggest a possibility for them to actually lose that much market share, then you may be able to demonstrate that losing the market share is far more impactful than any currently possible fines.

Losing a few techies who care about things like this when Google has literally billions of users? This is exactly what governments are meant for.

You know what, I think I will just do both since both are exceedingly easy to accomplish.