Most popular sites have huge lists of compromised machines. You can't really do anything with them though. If you block compromised machines, you'll blow up you

Most popular sites have huge lists of compromised machines. You can't really do anything with them though. If you block compromised machines, you'll blow up your support team by people complaining they can't reach your site. It's not in my interest to "Citizen's Arrest" someone with a pwnt node.