They already blocked it once. As they normally block domain and IP, they ran into issue when owner of blocked domain set the A record to 127.0.0.1. The same "h

They already blocked it once. As they normally block domain and IP, they ran into issue when owner of blocked domain set the A record to 127.0.0.1. The same "hack" was used to block Google and other huge sites. Once they found out this "hole", they introduced a white list of resources which shouldn't be blocked. These guys are really "smart" )