@steemit admin is there Way to put. Logic that you can only reply on other comment not on yours? Honestly. Not certain we cant stop people from doing this because... This is decentralize??? Or if someone from steem admin can do the logic that i suggest.
You can only reply if others place comment.you cannot place comment or reply on your own post
This doesn't fix the issue though, these guys have at least 3k accounts and can just comment on each other to avoid that so it's only inconveniencing legit users