Two reasons: 1) The top ISPs and the top media companies are one and the same. They're all cable providers and some of them are subsidiaries of entertainment c

Two reasons: 1) The top ISPs and the top media companies are one and the same. They're all cable providers and some of them are subsidiaries of entertainment conglomerates. It's their own content and their own cable TV revenue piracy threatens. 2) They're getting paid. Instead of handling infringement notices being a cost center, it can be an additional revenue stream for them, in exchange for a little throttling of the customers costing them the most in paperwork.