Myspace parental email blocking

Myspace recently announced that they will now allow parents to submit their child’s email address so when they attempt to create an account using the email address, it will prevent them from creating the account. I really don’t understand the logic behind this. A new email can be created in less than 5 minutes and most teenagers are aware of this. It’s great that they are trying to do something, but I don’t see it being very effective. Any thoughts…?