And still too many artists instead of pages like deviantart, artstation or pixiv.
vTubers of various agencies and indied also using it as a main communication platform. Youtube communities usually as a 2nd platform.
Hadn't used it for a couple of years, I went back there shortly after the whole Rhode v Wade debacle in the US and the place was a cesspool, the forums were horrendous. I actually went and wiped my account because I didn't want to be tempted to go back.
Also all the old artist resources and community made stuff that I used to be part of was either inaccessible, unfindable, or just wasn't catered to anymore.
Before you or someone else mentions Mastodon (and probably compare it to the Reddit migration to Lemmy; I've been through this conversation before): Both Twitter and Mastodon are built on the concept of following people. If those people don't migrate to another platform, then the people following them won't migrate, either.
But Reddit and Lemmy are built on the concept of following ideas. It doesn't matter if one person who, for example, enjoys anime, only stays on Reddit. Others who who enjoy anime may move to Lemmy and become part of one or more of the anime communities on Lemmy instead.
I can't speak for all, but: porn. I have a bunch of people I follow, it's literally the only reason I still have an account. Waiting on a bluesky invite but not all have signaled migration to another platform so... I just want to see twinks in kink gear sigh
The ability/button to message you is disabled in Thunder, but you can hit me up with any public contact method I have, just check my site (username + .com).
Porn. The porn side of Twitter is still intact and really quite... okay I was gonna say "wholesome" but maybe I should say "holesome"? Ehh? Ehhhhhhhhhhhhhh?
...anyway.
That said, a lot of adult content creators have been creating accounts on bsky once they get invites. If bsky opens up more there could actually be an exodus.
Only three of my Twitter porn creators are on bs so far (out of ~100), but one of those is very... important (?) to me. He's a lanky tall hung uncut sub and nudist. Whenever I check Twitter, I'd always go to his page first.
We only need a few creators like that to tip the scale heavily, imo. Good content, large audience, regular updates, just nudging their viewers a bit.