Heya bud! You know we were talking about this very thing on Matrix today. For now we're removing some of the spammy kbin.social communities on Lemmy World but that seems to be a bit bugged as well.
When we announced the move - the kbin developer actually showed up to explain that it hasn't been easy for him to catch up with these spammers either. This is the comment https://lemmy.world/comment/3558276 - good news is there are some changes coming up. So fingers crossed we don't have to deal with this for long.