Japanese carrier KDDI has underscored some of the problems of Android by pushing ads into Android itself, customers have found for themselves. A bundled, unremovable app for the company's own app store, au one Market, pushes ads into the notification bar whether or not the app is running, Asiajin said. While there appears to be an opt-out clause, one subscriber reports that it's downplayed and has seen it appear twice with app updates.