if they had a rule in the autoblock subscription that if a name appears in 3 or more (configurable) subscribed moderation lists it gets autoblocked, then users could stop following bad actors and change what moderation lists they use over time with less large impact to their experience. if you see messages from someone and they're on one of your block lists, you might reconsider the list. if they're on 2 you might consider personally blocking them, and if on 3+ you'd never see them. make blocks require a reason as well that the user will see alongside their block.