In order to decide if they want to send you the games, they need identifying information in the form of your account, otherwise they won't give you the games, which may well be in a different "tube" (it's okay, I know they're called ports, you can use real terminology).

Any programmer worth their salt will know that the way to prevent this kind of tampering is to make the phone home data go through the same port as the account data. That way you can't block it and keep using the service. This especially makes sense since the phone home data will necessarily be tied to your account.