The Fediverse has multiple hosts. And the option to host your own should you choose to do so.
I've been on the Fediverse for nearly a decade. I've jumped instances a few times. I'm currently with an instance run by a friend I've known online for well over a decade, who does have a strict moderation approach, but is also reachable out-of-band and is quite responsive and principled.
On Reddit, Google, FB, etc., you've got a single provider, and if they freeze you out you are fully frozen out.
That friend is not the only moderator who can impact your account though. Someone else on the instance you're on might do something silly that gets it defederated from a ring of 100+ other instances that share a blocklist. You might have friends on those instances you can't communicate with now. Do all 100 of those servers expose the admin's email? Do they respond? Are you going to go through that work in the first place? Obviously not.
It's weird to have to explain this to someone who's used Fediverse services for nearly a decade.
After a ban, it's no easier or harder to make a new account on a new mastodon instance than it is to make a new account on reddit/google/fb/etc. You're never fully frozen out of anything, that's not the point. The point is that gmail will never stop accepting emails from yahoo addresses regardless of how many badly behaved yahoo users there are.