@evan i know this is a timely reference to what a certain platform is doing, but blocks in ActivityPub C2S don't prevent someone from fetching your public actor data, and also have no bearing on cached, replicated, or syndicated data viewable in remote services or applications (as popularized by the "instance" model in the fediverse) unless you federate the Block activity with S2S and hope that the remote service or application understands and respects that.