It's not really that weird.

People who uses dating apps are on a very specific mission (to get laid, a.k.a "to meet more interesting people"). They'll optimize their profile to specifically archive that goal.

TikTok accepts wider range of interest-based (instead of goal-based) contents, and have much wider demographic spread. On that platform, you show more aspect of you and your life to your viewers, and that creates a degree of trust and maybe even empathy, both are beneficial in creating a closer relationship.

And it's not just on TikTok, I first noticed the effect in online games. For example, people who act kindly often get a lot of friends, etc.