Well currently an admin could easily intervene and stop a migration by removing the community mods, to be fair.
For example, now that I am working on an AP server, I can take all your posts on [email protected] and mirror them on [email protected]. I could also avoid sending notifications to you, so you’d be aware of this only if you visited the site directly. How would you feel about that?
I mean you could just copy my posts anyway manually, if you were so inclined. There wouldn’t be much I could do about it no matter how you did it.
I’d object and probably complain and it’d get your instance blacklisted. I’d support all community migrations being made publicly known - so you can see the timestamps and paper trail of a community.
But this isn’t quite the way that community migration would work here - it’s not quite the same thing. You would be attempting to give the impression I am actively contributing to a community I’m not - whereas I’m talking about moving a community from instance A to B. The community for all intents and purpose is the same.
If I posted actively to a community I do not own or moderate and they moved server and thus took my posts there with them, I wouldn’t really object to that.