>Chinese ownership as a security threat is currently in between reality and conspiracy realms but the US govt meddling as a threat is a proven reality worldwide.
There is nothing stopping any country from doing the same to US companies' local operations five years ago, today, or next year. The difference is that the US is not China. Your comment assumes that a US company is as dangerous as a Chinese company. As felipeerias said, China is (among other things) actively backing Russia in Ukraine.
US law did not require TikTok's divestiture to a US owner. If TikTok were a Canadian, British, French, German, Korean, Japanese, or Taiwanese company, the US government wouldn't have intervened in the first place.
Conversely, if TikTok were a Canadian, British, French, German, Korean, Japanese, or Taiwanese company, American would not have to fear a hostile government silently gathering data on American users, or a company repeatedly shown to be lying about using its app to do so.