I think the problem with online forums such as Reddit or Lemmy is still just the plain old content filteration. The first thing, when opening a Lemmy server, I see is a HC political memes about free-speech... aka. yet another dopamine well. We have pretty good a LLMs, it shouldn't be hard to categorise these posts and apply some filters. I would smash the button "filter out non-nuanced political posts" so hard...