have never been spammed [the bots probably know am a crap replier or just not worth it] but,this is a common problem,have seen it getting worse amongst users,if look through the pages on this board:
http://www.wrongplanet.net/forum13.html will find lots of posts about these bot messages,and people have posted about it on other parts of WP as well.
maybe WP needs better spam protection,though problem with using too much of it is they make a forum more inaccessible to people with affected impairments,eg,ones that ask maths questions and the person joining has learning disabilities,or ones that relie on intelligence or visual perception.
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>severely autistic.
>>the residential autist;
http://theresidentialautist.blogspot.co.uk
blogging from the view of an ex institutionalised autism/ID activist now in community care.
>>>help to keep bullying off our community,report it!