Pardon my higorance but if a spammer is clever enough to set up the system of world wide zombies.

wouldn't he keep a list of them safe somewhere long with his ways to access?
not that he would be able to resurect it himself without being monitored,. But wouldn't he have customers in Russia or Moldova that would pay for the information. And wouldn't he have them in his back pocket in the event...................

Obviously it would have a declining value the longer he leaves it but....