They don't, hence why EU has data residency requirements, and American companies set up firewalled entities to comply (eg. Azure Germany).
American companies have a legal system to protect them against unlawful requests. That rule of law is under attack, but exists, which does not seem to be the case for China.
Re:TikTok to Sue U.S. over Ban
by throw44532 on Tuesday August 11, 2020 @11:11AM
(#24121116)
Don’t National Security Letters and a Secret Courts bypass that?
So basically, why should anyone trust a US company if US thinks tiktok giving data to their government is a problem?