it is Trump's strategy to be trusted by the public that he is a type of nationalist person, on the pretext that tik-tok can steal user data so Trump is now banning China from trading and influencing US society from the influence of tiktok, of course this happens because there is trade war between America and China. but indeed Trump is a very nationalist person.
The ban was a justifiable action and I think that it is a good thing that he did that, the evidences that TikTok is taking sensitive data without the consent of the individual is very alarming. The fact that there is a tension between these two countries makes this a serious matter.
Look if they have proven that the app of Tik Tok is spying on their users I think they have the right to ban it because first of all it is violating the privacy of its citizens and it is one of their first rights being a citizen, if the government doesn't act properly then they are basically not interested in protecting their rights. This is really not about the protection of their economy or the internet being regulated but the protection of their rights. And also I'm still wondering why these app stores like Apple and Google are still keeping Tik Tok available for download even if they have proven it spying to their users.
That is the most decent move that they can do, if the app does not properly and explicitly displays that they are taking data of individual users means that they are breaching the privacy, the case is similar to Facebook and other social media platforms but they atleast have the decency of making sure that the user is aware that they are collecting their data.