i.e. there's no municipal/state licensing requirement, no regulations to adhere to, no business insurance, etc...

however in this case the law may be on the side of the driver:

California Vehicle Code Section 26708

(13) (A) A video event recorder with the capability of monitoring
driver performance to improve driver safety, which may be mounted in
a seven-inch square in the lower corner of the windshield farthest
removed from the driver, in a five-inch square in the lower corner of
the windshield nearest to the driver and outside of an airbag
deployment zone, or in a five-inch square mounted to the center
uppermost portion of the interior of the windshield. As used in this
section, "video event recorder" means a video recorder that
continuously records in a digital loop, recording audio, video, and
G-force levels, but saves video only when triggered by an unusual
motion or crash or when operated by the driver to monitor driver
performance.
(B) A vehicle equipped with a video event recorder shall have a
notice posted in a visible location which states that a passenger's
conversation may be recorded.
(C) Video event recorders shall store no more than 30 seconds
before and after a triggering event.
(D) The registered owner or lessee of the vehicle may disable the
device.
(E) The data recorded to the device is the property of the
registered owner or lessee of the vehicle.
(F) When a person is driving for hire as an employee in a vehicle
with a video event recorder, the person's employer shall provide
unedited copies of the recordings upon the request of the employee or
the employee's representative. These copies shall be provided free
of charge to the employee and within five days of the request.


If the driver or Uber can show that the passenger is or should have been aware of the camera's presence then this lawsuit will go nowhere.

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"Where was the peace when we were getting shot? Where's the peace when we were getting laid out?
Where is the peace when we are in the back of ambulances? Where is the peace then?
They don't want to call for peace then.