NextDoor is the way it is because they don't do any content moderation at NextDoor HQ - they depend on local "Leads" to do the work. Unfortunately, this model doesn't work. The same person that wants run your HOA and drive you crazy is the same person that becomes a Lead.

Once one Lead gets in, only they themselves can promote another person to Lead. In my neighborhood, we had one thoughtful Lead, and one insane Lead. The thoughtful lead carefully deliberated about adding more Leads, while the insane Lead picked her cronies - and then eventually "overthrew" the thoughtful Lead.

NextDoor has terrible content moderation and no penalties for infringing users. It's absolutely vile, amplifying the most minority of opinions with no consequences.