[Analemma_]

I have two responses to this:

1) Anyone is free to make a Mastodon host with no moderation (except for what's necessary to avoid running foul of the law), but I doubt you'd get a lot of takers, at least not among the sort of people who would build a functional discussion space. Probably you'd just end up with 4chan again.

"You can lead a horse to water, but you can't make him drink": lots of people have decided they want moderation, usually for good reasons involving harassment and abuse. People often want echo chambers too; that's not great for us in the long run, but it's difficult to make a moral argument that people's preferences should be overruled and they should be forced to listen to content they'd rather avoid.

and 2) Mastodon is no worse than the situation now with Twitter: Twitter also has a set of baked-in standards for moderation, and also allows you to live in an echo chamber if you want, with blocking. At least with Mastodon you can choose the type/degree of moderation you prefer.