I believe that in most networks, there’s at least some level of moderation to prevent the worst behavior. But beyond that, moderation becomes a much trickier issue.
When you have hundreds, thousands, or even millions of people in the same “park,” what kind of “ground rules” can we all truly agree on? It’s not like we’re gathered around the same dinner table, where a single moderator can keep things civil enough to avoid a brawl. Even then, heated arguments aren’t uncommon.
In an environment where one person’s truth can be another’s misinformation, I’m not sure moderation can ever be applied in a way that satisfies everyone involved.