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People in the EU can explicitly share data with other people, they aren’t trying to take down the phone system.

Yeah, to the user who requested it. Also, it's just the user's post, not the user's tracking/advertisement data.

So the only thing the US government could get, are the public facing posts/images which the user posted but nothing more. If the profile is private, even less. No messenger data (except when send to users in the US).

You can access EU-served data from all over the world, that's not a problem. What's in question is bringing data from EU residents outside of the EU to process it.