The shred of evidence is that GDPR applies to EU-based services just the same.
But instead you have administration that wants to ban encryption and increase surveillance as much as possible. The idea that the EU cares about privacy has no credibility at all.
I have a suspicion you're talking from a USA standpoint, where antitrust is enforced based on provable harm. This is not necessarily the set of values that the EU population wants to live by.
The Dieselgate was already deemed illegal, making your remark a case of whataboutism.