Odpověď na názor

follow the money

pro utocniky je snadne sehnat si nove IP adresy, pokud stare zablokujete,
stejne jako zaregistrovat nove ucty u nove sluzby, kdyz to na stare znemoznite

http://articles.boston.com/2011-07-25/bostonglobe/29813517_1_anti-spam-efforts-spam-related-spammers

"Just three banks," they explain, "provide the payment servicing for over 95% of the spam-advertised goods in our study."