Fediverse memes

Because it illustrates the underlying issue: who owns the community, who gets to decide what happens to it, who gets to decide whether each individual user gets to use it, or to be moved elsewhere to a different instance entirely that they may know nothing about?

I mean again, this is just down to a fundamental difference between how you and I view communities. I view them as modular concepts essentially temporarily on a server space, being able to move if they do please. And the federative nature of the Fediverse means that badly run communities can be abandoned for another one with the same name.

An example here that's relevant: I unilaterally just moved obscuremusic from lemm.ee to piefed after lemm.ee shut down. It's a small community, but was it wrong for me to do that?

I would be in favour of automated prompts going out to all users informing them of community moves.

Currently it belongs to the mods, as too happened on Reddit, and to the admins. Lemmy is extremely authoritarian in nature btw, even more so than Reddit, e.g. Reddit does all of: (1) notifying users of a moderation event (e.g. post/comment removal) while Lemmy users in contrast may never find out that anything ever happened to their content

Reddit mods can absolutely silently remove posts without telling the poster. I don't know why you think they can't.

(2) providing a means of appeal or at least communication with the people responsible for that removal, chiefly the modmail but also similar means to contact admins

I don't think this is specifically omitted, just modmail infrastructure doesn't exist properly. You can still do it the old fashioned way by DMing mods.