Im not saying blizzard couldnt find them if they knew who it was, the cool thing about the internet is you arent there in person and you dont have to use your real name. In fact you can change quite a bit IP, mac address, phone number ect ect. It makes people very difficult to track down, and it makes things like child pornography available, if they could track them down they would (because everyone agrees that shit shouldnt exist), but because no one is dumb enough
(except for Dennis Rader) to use their real name and info its virtually impossible to track people down.
By your logic you shouldnt be posting on this forum because blizzard could track you down, they have your name, your credit card number and lots more info on you. better watch your back!