> What if you were just robbed or assaulted by a driver and Uber sends fake data about nearby cars when a cop is trying to use the app to track them down?

You can't use the app to track anyone down. Driver reviews of passengers and passenger reviews of drivers are annoynomous for this reason. If a cop is trying to track an uber driver they would be much better off getting the license plate from the passenger and running that through their system. Trying to randomly hail rides through the app in hopes that the abusive driver would happens to respond sounds like a waste of time when there are better alternatives.