As the owner of !scp@lemmy.fmhy.ml I agree! Lemmy move my sub!
I think it might be really easy to migrate a community that's already been on another instance for a while -- a little database-fu and the previously remote community becomes a local community.
I think the main problem is the naming and routing. Lemmy current addresses the community by name and not id. It would have to be restructured to allow multiple communities with the same name. Also this feature would not make a lot of sense until account migration is a thing. But the two of those together would be a nice feature.
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