I’m new to so still getting to grips. As I understand it, users from different sites in the fediverse have access to others and can share content when federated. Just like I’m on FMHY at Lemmy and you’re on feddit.uk, we can still interact on feddit.uk because they’re federated. The owner of feddit.uk could decide tomorrow to split from FMHY and I’d still see posts and comments but you wouldn’t see my comment here(those in FMHY would see me though). I’d effectively be banned (or in read only mode I suppose) even if the action wasn’t taken against me directly.
From what I understand, this is the case between Lemmy.world and BeeHaw at the moment which are 2 of the largest collection of users. The .world users can read BeeHaw and interact with each other there but not with users outside of Lemmy.world.
In both cases I fully expect that and entirely understand the BeeHaw admin decision, to the point I’ve thought about moving myself as I’ve seen a few posts already that make me uncomfortable. I wasn’t critiquing it, was just highlighting that “one dickhead mod” actions having a much larger potential impact here in the Fediverse compared to somewhere like Reddit where you’d lost access to only one sub (or a handful in the case of massive dickhead super mods)