[DecoySalamander]

It isn't dead in any meaningful way. Every time there's an issue with a service (Musk writes something obnoxious, 2 day outage, rules change) people create accounts on competing services, but are back within a week because those places don't have content or engagement. Some people do migrate, and it's possible to get the impression that Twitter is dead if this happens to your social circle, but to me it seems as active as ever.

[ghaff]

Dead is probably an overstatement and I agree that the alternative services don't seem to have a lot of traction, at least among people I've followed. However, in my tech circles, it seems like a lot of people (and organizations) just checked out of or way dialed down their usage of Twitter/X and relations. YMMV of course but Musk seems to have been a forcing function for a lot of people to reevaluate their use of such services in general. To the degree that there's a commercial winner, it's probably LinkedIn.