

Of course they would. Not only would they get their hands on data users fully voluntarily give them by using their platform, but they’d get their hands on verified IDs and quite reliable family tie information. The potential loss of users is definately worth it for them (from their perspective).
The US is a bit special. It is the only state to require its citizens pay taxes to it on (regular) earnings abroad. Other places only tax earnings made inside their own borders.
So to truly be off the hook for American taxes as a non-elite, you’ll have to renounce your citizenship.