ok, so I get that there's a multitude of lemmy instances and they're not exchanging data, in the sense that if there's community jimbo on instance rambo, all comments are stored there.

so if the operator of rambo goes "man fuck this" and shuts it down, the posts/comments are gone? there's no way to replicate them or sync them or whatever?

if there's multiple jimbos on different instances is there some aggregation type of deal or do I have to subscribe to all the jimbos out there? and if I have something important to say about topic jimbo, I just spam/crosspost my idea to all the jimbos out there?