We've already dealt with one problematic server by defederating. But, it was kind of an easy decision, because it was a private instance and it had a bot that was just posting every link from hacker news.
I’m a pessimist. I feel like inevitably, some kind of flamewar or drama will cause cross-board invasions between subreddits (and now, different [email protected] on Lemmy).
In all likelihood you are correct. I think we will have to come up with rules for the server and then if other instances cause flamewars here that go against those rules then we can talk about defederation.