So a couple of months ago an Uber driver with a concealed carry permit shoots someone who is firing a weapon at pedestrians in Chicago. What's Uber's response? Ban guns possessed by anyone--drivers or passengers--everywhere:
Uber Technologies says it is banning firearms of any kind during rides arranged through the Uber platform, and drivers or riders who violate the rule may lose access to the platform. The rules also apply to Uber’s affiliates.
Uber Banning Drivers & Passengers From Carrying Guns On All Rides « CBS San Francisco
It would be interesting to see what would happen in my state (Mississippi) for a passenger with an enhanced concealed carry permit who enters an Uber vehicle:
In Mississippi, permit holders that complete the training course and receive an endorsement can bring their handguns everywhere except for police stations, jails, courtrooms and federal property regardless of gun free zone signs.
Governor Bryant signs new concealed carry bill | WREG.com
I can see this hitting the courts.