i really don't know. tuppence to read an article, or watch half an hour of vid, you wouldn't even count it up. seems very simple. so many people sign up for loyalty cards etc, it could be like that, you'd just fire in your password and it would land on your card.
in fact, if someone did it in conjunction with loyalty cards where you could use points for telly, the supermarkets could own everything about us, iykwim?