A solution to slow this that doesn't involve chat splitting is introducing friction to onboarding in an otherwise open community. A Discord server in-which I'm

A solution to slow this that doesn't involve chat splitting is introducing friction to onboarding in an otherwise open community. A Discord server in-which I'm active routinely executes arbitrary kicks on new members (not bans) as a matter of course. A determined new person would reach out to pretty much any active member, request an invite, and be allowed back in. Users are expected to carry server invites on them at all times. Users that seem excessively active are occasionally given temporary bans, and told to "touch grass". Nobody's upset by this, because kick permissions are given to all active members, and revoked from members who use them to pursue vendettas. Moderation privileges rotate pseudorandomly among the active members. This kind of hazing selects for people of good humor, who are willing to work to participate in the community and aren't emotionally volatile, but who are mature enough not to be too upset if they lost access. It's a good culture without too much homogeneity, but it's understood that you miss a few good people to produce the environment. This isn't the solution to creating an online community, but it's an example of engineering a culture and onboarding process that selects for certain temperaments so that the community doesn't become diluted as is grows, and members who don't fit self-select themselves out of the population.