It depends. Blizzard can ALWAYS trace back an e-mail to you. But they don't. Your problem here would be if the website/program that is requesting your info has a ToS or EULA that doesn't allow you to send phishing e-mails. If that's the case, I wouldn't use that site/program because you probably will get in some sort of trouble. You could always buy a Visa/AMEX giftcard and use that. Just put fake info when it asks for Address/Name/etc.