Yes, your local government controlling your communication channels will result in far better privacy than some remote government who doesn't care about you controlling it. /s

Not in the slightest bit true.

The way the US bill of rights applies to non-citizens not residing in the US is complex, but considering how little the US courts care about the question, functionally we have no rights when dealing with the US government.

This is the lynchpin to things like seizing people passing through US airports and holding them indefinitely in Guantanamo bay.

At least my own government can't get away with treating me like a brick.

Parallel construction.

Better the devil you know?

Historically, doesn't seem to be true at all. Local law enforcement likely cares far more about prosecuting you individually and has far more means to do so, than some foreign national agency. Imagine if Twitter was based within one of those countries that had a major uprising. Would the locals still be as safe using it, as if it were based far beyond the control of their country?

Not really anything unknown about this situation. There are many obvious historical incidents.

Depending on your threat model, the very fact that Facebook and google are non European companies IS the privacy advantage. ..on the other side most people fear tailored ads more than their omnipresent government agencies. That's why I think people will like it anyway.

With an heavy emphasis on "some".