In the past few weeks I've been observing a lot of marginal content trending on the platform which indicates to me that a lot of the more quality posters aren't posting new content.
The minute quality creators leave a platform is the minute it dies. TikTok has not really been rewarding creators fairly, and pushes the idea that organic growth is possible, and that people have become really successful, but many creators realize after months of working for little to no reward that it's a false narrative.
There are billions of accounts on these platforms yes, but the main question is are they actively posting, engaged, and satisfied? The answer is most likely no, and that's why Twitter didn't sell fast too.
I wrote about this issue just earlier today -