I am surprised this is the first incident. Uber is an excellent way for the criminial circuit to get cheap hits. Not only sexual abuse but also theft, abduction and extortion. Step in the car, lock the doors and put a mobile signal distortion device in the back and boom you can take your passenger anywhere you want.
Much safer to paint your car like a taxi, put a fake sign on top and pick up anyone hailing without any records of you having ever done so.