Idea: if you mod a community on a lemmy.somewhere you should be able to migrate it to lemmy.elsewhere which would include all post & comment links being forwarded and subbed users having their subscription updated to reflect the new location.
I’m aware this would be a way down the road as user account migration alone is still not great but it would be a great feature for the fediverse to have to avoid centralisation and mod/server admin wars.
Possibly some kind of democratic voting system would work? Or maybe the mods must all vote to do the move. Just an idea from when I saw another instance do a vote (for federation) using emojis, on a post, and they just counted them basically.
(edit: The mastadon method seems feasible though posts need to move too.)