As a US citizen, I'd rather a foreign power with no jurisdiction here gobble up my data than the local jackboots with a rubberstamp judge who can execute a no-knock raid on my home whenever they feel like, predicated on dubious suspicion elicited by whatever precrime data-mining operation they're running.

China isn't going to shoot my dog at 4am and throw me in a concrete box.

And if I were a Chinese or Russian citizen, I'd be far more wary of domestic apps than US apps for precisely the same reason. Not playing favorites here, it's just a jurisdictional arbitrage question in a world dominated by tyranny.