The US has had by far the most aggressive foreign policy in the last several decades. There's simply no contest. No matter what you think of China's track record, it is clearly focused on domestic control and internal security. A statement like "Chinese owned media will actively look to harm you and the place you live" is delusion, not borne out by any of the facts. A frightening example of how easily the state can designate new scapegoats.
I am not looking to argue which country is objectively better/worse (although I disagree with your view, it's not important to disprove it for the point I am making.)
Whatever that is, I live in the US and so do many TikTok users. As a point of view of someone who lives in the US, being dominated by a foreign adversary is a bad thing. Giving that adversary control of what we see and think about is therefore very dangerous.
I totally understand that if you're in China your perspective on this will be backwards but here's one example: let's say China invades Taiwan which is our ally. Should the US defend our ally? Would china use its control of social media to make most Americans not aware/not care/be misinformed about the situation to ensure that the US does not get involved?
Again, not expecting you to agree, but do think that someone who lives in and likes the US to care about this