But seriously, aren't there any bright anti-spammers who could just take down this guy's servers?

If you read the article, you'll find that he's using multiple servers all over the world.

Theoretically, one could launch multiple massive DDoS attacks against these spamming servers, but most of them are probably already hardened against that sort of thing. I would imagine that spam servers are among the most frequently-attacked type of server there is.

Do the right thing -- report the spammer to his/her ISP and have the account terminated.

Most of these spammers are their own ISP.
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Tony Fabris