Most if not all of these are BOT attacks. (robot)

Someone has software that finds all the WebBBS systems it can, that don't have member passwords, then the computer sends a string of nusance SPAM messages.

If you think remembering your personal password is such a big issue, how about the person who has to spend hours a day, removing this garbage.

Sorry, but it's time to add passwords with email verification, to the club board and this BB.

If you didn't see what happened to the AC BB, which had to be shut down because it was bloated with so much spam, that it became usless, then you don't realize that these spammers can kill this BB or the Club BB.