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