the main problem for non-kbin users, as @ono is using lemmy, is that kbin moderation actions, such as a moderator or admin removing spam will not federate to lemmy, as this is not implemented yet.
for a lemmy user, it appears that kbin doesn’t have any moderation at all, while spam is being removed for kbin(.social) users at least.
for this reason, several lemmy instances have already either defederated from kbin or removed kbin communities from their instance.