> It seems clearly better, as a user, to use an uncensored, un-backdoored service based in a foreign country

This point of view I could have understood 20 years ago, but Snowden revelations happened in 2013. Before that, US social media have always been censored according to US social norms.

Uncensored, un-backdoored services from a foreign country have never existed.

As for sovereignty, considering the current US admin as well as US tech barons have been pushing their horses in several EU elections, it's pretty obvious that services from a foreign country with such policies are an issue.