I can't entirely blame people for going to bluesky. Like if you look into it at all, it's obviously a terrible place and it's going to have all the problems of twitter plus more. But, some people just go "social media is a place for me to loudspeaker for my business", business in this case being one person's art or music or whatever. For people like this twitter going away is scary, that's where they get the most views and that going away has the potential to be a bad thing.
Now, I think basically every twitter number is hugely overblown in terms of, ratio of number to real people that actually see and have a genuine interest in your stuff to people that would actually be willing to pay you for anything, but I suspect a lot of creatives are just kind of throwing tracks out in front of the train and don't have a lot of time to look up and steer as it were. For people like that, you see new site, you set up there and dump posts, then go back to work.
I still really think it's a waste of time to post there and think that everyone is better off for every single artist, musician, streamer, whatever that DOESN'T go there, but I understand why those people would set up there without even thinking and maybe push them to trying to ignore the bad parts if it means business keeps rolling. Only thing that helps at all is finding people on sites like cohost, doing business with them, and making sure they know that you found them because of that site and not the other, worse sites they might be on.
I also think some people are genuinely very addicted and aren't willing to accept that nor help, and telling them they're addicted rarely helps.