Because cm0002 is reposting content without prior permission, it made me think about it, people got a real hate boner for lemmy.ml but maybe they have differing opinions for reposting?
Sure, why not. And they can do the same over to their side. And stealing certian content from Reddit would also be good.
I assume crossposts are handled properly by Lemmy's feeds? I don't think I've noticed duplicates much. My answer would change if not, because there's going to be no way to predict people's replication preferences.
I have, before, posted one item that I thought was interesting on !technology@beehaw.org to !technology@lemmy.world, as I know that beehaw.org has defederated from lemmy.world and the item was interesting and otherwise lemmy.world users wouldn't have seen it.
I don't think that I'd try to mirror the complete content of a community, though. I mean, different communities may have different interests.