Every one of your complaints about individual servers apply to Twitter as it is already, and some of them I see as features. For instance, not completely losing your community because Twitter or Discord or whatever parent company decides one day you don't belong there.

You can move accounts to a different server if you stop liking where you're at, which is a feature nobody has elsewhere it seems.

I view Mastodon as if Twitter, a Microblogging platform, and IRC had a child.

Let's take the reverse tack though, and agree with your opinion that it's a clusterfuck. Twitter should be threatened by Mastodon because they're losing users to it in spite of all those "problems".