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It might be an unpopular idea, but I think being somewhat liberal with doling out timeouts and bans for inflammatory/reactionary/overemotional posting would do a lot of good, too. It strongly crystalizes community norms and sends a message that this is a space to engage with the higher functioning portions of your brain instead of letting your amygdala and dopamine pathways take the wheel.

Edit: Why is parent comment flagged/dead? Doesn’t seem that controversial?

I'd like to add to your point that private torrent trackers have had invite tree systems for awhile, and usually if your invitee breaks a rule, you get in trouble as well, so you are encouraged to only invite people you trust. The system has worked well for a long time, and some of these communities still thrive because of the trust that is built.