Earlier quoted context omitted.
> If the ultimate commercial relationship is between you and the hotel or airline when you book through Expedia, then it's just as fair to say that the ultimate commercial relationship is between the passenger and Uber/Lyft driver. When I book a flight through Expedia I enter a contract of carriage with the airline, not Expedia. This is a contractural matter, not just an abstract concept of "commercial relationship."
And when you take an Uber, you enter a contract of carriage with the Uber driver. Uber drivers have to have contract of carriage permits for this reason.
(In contrast, with taxis, signage in the vehicle indicates that proceeding with a ride does indicate acquiescence to the standard terms locally governing taxi services.)