Private means Private for Everybody
A 17-year-old student builds an app on top of the Instagram API. Everything would have been fine if the app didn’t include the possibility to upload pictures. According to this article on arstechnica the rationale behind the app was: "There are 15 Instagram apps on the App Store, and none of them have upload capability." On the App Store there’s a gazillion of iOS apps based on the Instagram API and none of them (except the official one) has upload capabilities.