@Gargron People point to the issue of "too big to defederate" as a reason that large instances like m.s are a bad thing. The logic goes that if bad actors are left unchecked then other instances can not simple defederate m.s because that would block too many other accounts. It is certainly true that it is not really possible to defederate a very large instance so large instances have a big responsibility to police themselves.
jbzfn
GhostOnTheHalfShell