I just can’t believe anyone still uses Twitter for any purpose.

At this point remaining active on the platform is more or less unethical.

A lot of sites have weight. Twitter sheds users every day but the large user count makes it attractive to public figures and if you want to follow that public figure you need to have twitter.
That’s why the more prominent the public figure is, the bigger ethical obligation they have to switch to Mastodon and force their followers to follow.
Cue a flood of Swifties when Taylor finds out about Mastodon.