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.
A good community leaving a bad server can maybe work if the server doesn’t just turn that off.
A bad community that was hosted on a bad server can continue to be blocked on a server level.
A good server tolerating a somewhat bad community will let users continue to block communities.
Two good communities on one server might grow large and want to split servers.