But the "spam" is no longer the issue, as ever since then, mod requests system has been implemented, allowing many new moderators to takeover communities with inactive moderators, as a result allowing spam to exist within these communities.
This wasn't the issue. The issue was that moderation actions didn't federate from here. I think that this hasn't been fixed and will be once the new ActivityPub stuff is done, though @ernest can feel free to correct me on that.
EDIT: Actually, maybe it has been implemented? Looking at @RedditMigration from Lemmy instances, it seems like the spam isn't there. If that's the case, lemmy.world should definitely reopen full federation.