Do they get adopted by other instances? Are they still accessible from other instances? Can you still post on them from another instance?
Edit: From my understanding every instance that deals with a community has a cached copy. Will that copy disappear after a certain time, because it can’t phone to home anymore?
I haven’t bothered playing with instances yet I just made my account yesterday. I need another account if I leave lemmy.world?
If lemmy.world dies, you’re account goes down along with it. You would then need to find a new instance and make a new account.