This is just amazing. A “botnet” of 50,000 zombie PCs is considered a very large number, and is more than enough to bring down nearly any site via a distributed denial-of-service (DDOS) attack. The goal is to extort sites for money by threatening to take them down. There are firms that specialize in helping you survive a DDOS attack, but these guys had 1.5 million zombies. I’m not anyone could weather something like that (except perhaps sites like Windows Update).