NSA can't harvest user data from tiktok because it's Chinese based, so they force them to split and sell to American subcompany that is obliged by law to give them access to their server. Everything else is political bullshit, like the Chinese gouvernement can "weaponize it's app" ?? They can't turn teenager into terrorist hating their country just like that, tiktok can only influence so much.
Cmon that's not that difficult to understand: The same reason usa bans Chinese app. China, just as usa, has mass surveillance system and want to get every single data, they can't do that with apps owned by usa based companies.