TikTok is interesting in all kinds of ways, across all kinds of dimensions.
To me, the intersection of issues does create a special case.
There is China's suppression of free speech within China overall, including its suppression of TikTok. Its sister app Douyin is heavily censored. This includes its lack of business/market reciprocity by banning Facebook, etc.
Then there has been China's censoring of posts on TikTok (at least in the past, claimed to be no longer the case).
Chinese governments institutionalized oversight and access options into any level of its countries businesses, ... China's general international propaganda efforts take on a different level of meaning when they include control of hugely popular consumers social networks.
I don't think there is any simple or obvious principle based solution to TikTok.
And of course, related to this whole discussion, China isn't going to disclose, or let any company in its influence disclose, any of its troublesome behavior.
Making even conspiracy level doubts about TikTok's actual motives and behavior reasonable to entertain in a legal sense, since we know China/TikTok will be intransigent about any kind real open analysis of that they are actually doing or not at the China's governments behest.
China does not provide its own judicial review process to check its own behavior, supply any constitutional or legal commitments to hold itself in check, provide any cooperation with outside oversight, or have any reciprocal agreements with the US to cooperate in limiting information warfare.