@nickcolley @rachelcoldicutt I think that should be done carefully. I picked Qoto as my initial instance, only to realize afterwards that I'm effectively shadow banned from parts of the Fediverse because of it.
If niche communities want to defederate, that's one thing. But if larger instances defederate, it creates fragmentation of the overall community.
But generally, I don't think new users have a good way to know which parts of the community they will have contact with, let alone why, when they join an open instance. I think that's a really bad thing and it's also only weakly correlated to managing abuse.