You skipped a few. - Build a real time monitoring system of people travelling on these services to allow instant arrests by diverting the vehicles. - Sell all

You skipped a few. - Build a real time monitoring system of people travelling on these services to allow instant arrests by diverting the vehicles. - Sell all the data to advertisers and unscrupulous individuals, who may or may not be stalking someone. - Allow authorities to use the cars as weapons to kill dissidents and other threats to government. Building something this complex and all-encompassing goes 90% of the way to building a dystopia.