Pretty sure users have mostly left.

Companies and public figures keep using it, because for most of them it's just some intern or bot that was posting.

It takes a while for social media to finally die because of that. They'll just stumble on like a zombie for like a decade.

The only way it'll happen faster, is if people loudly boycott anyone that's still using it. But with 99% of social media sucking ass, there's not really a place to do it from where companies and public figures will hear it.