There's many promising looking possibilities, but if they can't get market share they'll be also-rans at best. Mastodon has the benefit of bright-eyed idealists and tech-fetishists that guarantee it has and will continue to have a market share, the same way IRC is still going even now that we have a thousand mildly improved options for chatting with people.
These other projects have nothing right now, and most of them will fail and probably wind up having their user data used for credential stuffing attacks.
In other news, I saw some people freaking out about AI coding. I'm a unique beast, in that I know how computers work but cannot write code due to some highly specific dyslexia -- I figured I had to give it a try. Suffice to say, the state of the art there is more along the lines of HackerTyper than anything useful. At best it will be a tedium-remover, since it can't even produce working Python code without involving debugging that my dyslexia crashes ashore on. Fucking about with wording can get you some results (I almost hacked my way to something that could produce an error further than ten lines down!), but you have to already understand computers well enough to make it irrelevant for most everyone BUT me, and it's useless to me because I can't debug it. You can't stick your manager in front of OpenAI's Codex and have him produce anything much more complicated than Hello, World. Coders aren't out of a job. The AI Art Thing this ain't.