By far, the majority of my time "online" these days is spent in a Discord server for enthusiasts that are also interested in my hobby. Due to the server's small size and narrow niche, moderation is straightforward and we rarely have any issues with trolling. We don't allow political discussion, which mostly allows members of diverse backgrounds to interact safely, since triggering discussions don't come up very often.
It's not even a particularly novel idea, right? Chatrooms have been a thing just about since packet switching was a thing, this one is just a polished implementation of that idea. Trouble is, the one metric that matters to Google (inter-linking, engagement, etc) can't happen when the content can't be crawled in the first place. So our pleasant, intellectually simulating content stays hidden where the rest of the internet never notices it.