You kind of have it right now just go to usenet. Pretty much zero moderation, anybody can say anything, but there’s nobody there to listen. Because it’s too noisy. Heck even the spammers gave up, there was nobody there to spam. It wasn’t even worth spamming anymore
You can always run your own server with your own rules even if that rule is no rules.
The beautiful thing about the fediverse nothing stopping from someone running a server like that. Maybe common sense but nobody else is stopping them.