I'm pretty curious about this as well. I read an article a few weeks ago where some developer went into how TikTok is "worse" but nothing stuck with me about it but it was posted here. It's been mentioned a few times that the real problem is the data collected is sent back to China and Singapore but again I'm not entirely sure how that's "worse" than having it given/sold to companies and governments outside of Asia.
I don't think it's about whether or not it is worse than FB etc. I don't think it is..it's about who it reports to and what their motivations are. If FB was reporting to an openly authoritarian and hostile regime...we would probably having this conversation about them. (and currently we sort of are actually given our govt issues)