Everything you said is an attempt to find a rare case to make your point. I do live in a bad part of town where insurance companies cancel on me because of risky neighborhood and I use uber many times a week. Majority of my drivers are african americans or a minority who would not be able to drive a Taxi without fronting a lot of money or have a connection with a someone who will rent a medallion and then of course do it full time to break even. I even had family members who drove Taxi and it was so miserable for them because on off seasons they barely made enough to cover gas and medallion rental. Minorities that have a hard time getting work or living in areas with economic drought (chain stores moved out due to white flight or crime so jobs are far away) can just drive uber at least as supplement which is what they tell me they do when I ask them.

As for trans folks, their face should match what is on their ID. This is a safety issue. Even if your stare or country won't let you set preferred gender they won't stop you from updating your picture. Bad guys can game the system otherwise.