No one takes responsibility! Parents just scream and Itunes refunds them. They should stop doing that, except in very extreme cases. With every device there should be a huge notice about in app purchasing; what it is, how to disable it, with a short paragraph about "free games". Make it explicitly known that purchases will not be refunded, even if be made by children. Don't give your kids these things to play with in the first bloody place! How stupid is that!