I agree that these mechanics will always play out at scale, unless users are in charge of moderation/curation/governance. Successful cases in point: Discord:

I agree that these mechanics will always play out at scale, unless users are in charge of moderation/curation/governance. Successful cases in point: Discord: Closed bubbles, users in absolute control of entry and moderation. Still going strong. 8chan: Open bubbles, users in absolute control of moderation. You also had conservative alt-right and LGBTQ communities, cleanly separated, mostly just ignoring each other. Only got killed by "black-swan" events and the subsequent pressure from press attention. Tumblr: Organic user-powered curation via likes and reposts (vs Twitter/FB style "AI" algorithms having their way), you had LGBTQ, neo nazi, porn/conservative communities existing in parallel with effective but organic and moving boundaries. Only got killed by external pressure from advertisers.