Uber engineering does, there is extensive work that goes into the app to ensure drivers aren't GPS spoofing or that an actual ride is occurring. I.E. Check the accelerometer or gyro. That said theres a natural tension between making the app accessible to drivers and locking it down to protect riders. I.E. Disabling the app if your phone is rooted/jailbroken. But again you are limited to privacy, the api's for the devices you have to support and managing how accessible the app is.