I don't think spam bots are always doing the actual posting, just the signing up, they have to verify their email address. I had a feeling that bolshakko was going to turn out to be a spammer, if you google the name it comes up in a lot of forums with no posts, but I wasn't sure so I just left it to wait and see. Every time someone does this their email domain, unless it's a popular one, gets added to the list of banned addresses, so their bot sign up programs can't sign up with that email address, and their IP gets banned too. There's always going to be people trying to get links to their sites though, we can't dop much about it apart from keep stopping them, and adding their details to the ban list.