Lemmyβs security
I think you mis-spelled moderation tools, nice quick fix would have been to block posts from new users on X instance and have a pinned post briefly covering why - theyβll eventually run out of instances that donβt have open signups IMO or just give up.
Another mod tools option would be rate limiting of posts, i.e. users can only make a new shitpost every 10-15min, rather than unlimited times per minute