Unless the Fediverse sorts their censorship issues out, it's not going to get anywhere near as much usage as Twitter. If you don't follow a very narrow political viewpoint then you'll almost certainly get banned from whatever server you signed up for.
They all enforce this on each other as well, with a shared block list of servers on which the operators allow users to say things outside of this narrow political viewpoint.
This sort of restriction on speech isn't conducive to a healthy community where ideas and thoughts can be shared freely. Instead it's more like an authoritarian state where you have to be super careful about what you say, under threat of exile.