Keep in mind that much of that is a constant struggle between moderating and Zersetzung. If somebody doesnt like free discourse, all they have to do is increase the moderation burden for such sites. Knowing full well, that the more rules you have and try to enforce, the more of an echochamber you become.

Still beats the toxic effects of curating identities in an social media echochamber. Dedicated boards also work as plumbing on chans.

edit: Totalitarians are also not shy about employing Zersetzung. For example, the CREST Research ("Mining the Chans") people are very open about attacking chans through AI generated garbage/extremism content to make them unusable. So chances are high that this is what you are seeing and reacting to.