I do the same. Mastodon, Bluesky are fucking ghost towns, and of those who opened accounts, few use them. Lots of artists didn't even do that (and have no alternative methods of sharing their content), so for lots it's 🐦 porn or no porn, and brother idgaf what y'all think, I'm enjoying my porn.
I still have an account so I can see replies and such. Elon made SMS codes part of Twitter Blue, but authentication apps and security keys are free. It might be one of the only somewhat sensible things he's done with the site, seeing as it's pretty expensive to send out codes over SMS.