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In my experience these “containment” boards/servers/sections tend not to work.
Long term it basically just creates a place that attracts those you don’t want, and becomes place for those ideologies to spread. Then it either gets bad enough they take over (you know the site) or they break off wholesale and form a new community dedicated to those worst impulses (pyrrhic victory at best).
The best policy is to actively moderate, and in the case of the fediverse, defederate, those groups and those that give them shelter.
I finally made the move to setting up an account here and wean my reddit usage.
It’s getting so bad on there, so many bots, trolls, and paid agitators. Plus the uptick in fascist apologists. Smaller communities with higher bars to entry produce better conversation, in my experience.