Again, Uber's fault.
Uber Firearms Prohibition Policy
Our goal is to ensure that everyone has a safe and reliable ride. That's why Uber prohibits riders and drivers from carrying firearms of any kind in a vehicle while using our app.*
Anyone who violates this policy may lose access to Uber.
https://www.uber.com/legal/policies/firearms-prohibition-policy/en/
“Uber prohibits riders and drivers from carrying firearms of any kind in a vehicle while using our app.”
Uber does not have the right to regulate this. They do not own the cars. They do not employee the drivers. So, for the record, I disagree with them for adding this to their corporate policy.
There really is nothing to stop drivers and passengers from carrying though. The only additional risk to those who concealed carry is being banned by Uber if they get caught. And how would someone get caught?