I think that is a current weakness that’s being worked on, I’m seeing requests of more or less that github.com/LemmyNet/lemmy/issues/4485

to make it federate or block, but unless I’m missing much newer updates, that is kind of the problem. My guess is on the whole it mostly resolves itself as… he probably will piss off the mods of cafe eventually as well, and the limited audience of only being visible to cafe would result in a near shadow ban effect to mostly starve them out.