> Uber does not let you choose your clients because they discovered discrimination occurred based on who the client was and where they were being picked up from.

It was pretty well known that getting a cab from certain (non-white) neighborhoods and just hailing one as a PoC was very hard pre-Uber.

You could always lodge a complain at the centralized taxi authority where some bureaucrats would input it in "the system". But in the end it achieved nothing. Uber kicking out racist drivers probably did more than decades of complains.