That’s not entirely true; it seems to depend how much effort you put into informing them that you want to cancel. If they make it too difficult, then they’re creating all sorts of legal issues. They’d have to be pretty ballsy to sell it to a debt collector at that point—it does happen, but it’s pretty rare, and I’ve never heard of anyone actually being forced to pay in the end. That BS just isn’t going to hold up in a courtroom.