These seem like standard things any analytics tracker (including GA) tracks, check out amiunique [1] for a set of things that can be tracked using your favorite secure browser.
Yet, the rest of the content on Tiktok is very low threat. No chat, no personal health forums, no private photos. It’s mostly a consumption platform with very little input from the users besides those listed in the linked thread (I don’t find that data particularly scary vs what we’ve accepted as normal in the internet).
What’s scary about tiktok is how addictive it is and how it is very much engineered and optimized to be so. Some in the new world are fine with this, I am not.