Earlier quoted context omitted.
Yes, all problematic users don’t congregate on the same server. Problematic users can pop up anywhere. However, a server could fail to moderate effectively and become a source of misinformation and trolling. That’s the benefit of federation: it ensures a minimum level of moderation quality. Servers that don’t moderate are blocked, which sets up the proper incentives.
What's misinformation? Things you don't think are true? Things the instance admin doesn't think are true? Things officially deemed untrue by the State? Or by the UN/WHO? Is is considered Misinformation if it was deemed Untrue in the past by State Officials but is now Official State Policy? We have always been at war with Eastasia. We have always recommended the wearing of masks. We have always seriously considered th…
What's the definition of too low? Up to the admins of that server.