Uber is always embroiled in controversy for one reason or another. To a greater extent when we talk about this interesting service to move from one place to another in the big cities sharing a car, there are always people, groups or entities that are against it and in this case Apple's CEO himself threatened Uber to remove the application from the App Store for a somewhat tricky reason about the privacy of each of the users who ever used the application on the iPhone. In this sense, Travis Kalanick responded forcefully by warning that what they were doing was preventing their own drivers from scamming them, a somewhat complicated issue to manage that reached the extreme and Apple almost eliminated the app from its store.
Apparently Apple detected that Uber was identifying the iPhone and this is something that is totally prohibited in the applications of the Apple store. In this sense, we talk about the identification of the iPhone even though they had eliminated the application from the device. Gruber, came out in defense of his service, noting that some of his drivers were trying to cheat the company with stolen devices, creating accounts that would later be eliminated to create false routes and earn more incentives without actually performing as many services.
In the New York Times we can read this news in full and in it you can see the details about this problem that occurred with the Uber application and the drivers who tried to deceive the company. Monitoring iPhones even if they no longer have the application installed is something that Cook would never allow and that is why he warned of eliminating the app if this "control" of the iPhone was not stopped. A complicated issue without a doubt and not without controversy in the face of a service that is usually always at the center of the hurricane.