Depends on the company. If it’s a Chinese company like TikTok, data is stored in China and therefore property of the state. Things are about to get worse and they crack down on private companies in China.
And it’s not just Americans who worry about this. When word got out that Line was storing user data in China servers, it blew up in the news in Japan and Taiwan and went into immediate investigation. Line ended up moving Japanese user data to South Korea. Chinese aggression and Xi’s obsession with power is not just something Americans spout off in Reddit and YouTube comments. They’re a legit threat to Taiwan, Japan, Australia and India.
https://asia.nikkei.com/Business/Technology/Line-cuts-off-ac...