These bots seem familiar. Years ago, it was the old forum, there was a Russian (An old player who got banned) who is always spamming bots in the forum, replying to every thread. (I forgot what thing he was always posting but it was spam) I guess he may be the same person doing all of this or maybe some people who got the idea from him, and that's why the bot spamming started in server world chats. Pretty clever I think, to annoy people so much.