There's a difference between the product made by a manufacturer, and the OS distributed by Google (their "service"). If we are talking about Google's incentives, than we have to look at their relationship with Android as a product. They are giving away Android to manufacturers for free. It's _Google_ that has the incentive to sell the users' data. That we purchase devices preloaded with Android doesn't pass that sale off to Google (like it would to Microsoft with a Windows computer), so it doesn't take away their incentive. So for the purposes of determining at what social cost you use Android, it might as well be gratis.