They're not just talking about how much of the fee that drivers get to keep, but the rate they charge riders.

>Uber sees itself as an “agent” acting to connect the actual “merchant,” the driver, and the customer. [1]

Under the theory Uber is operating on, it's weird that drivers can't directly set rates with riders.

1. https://www.marketwatch.com/story/uber-an-early-adopter-of-n...