WSJ article on Uber’s take rate from this week:
Uber Tests 30% Fee, Its Highest Yet: Company now charges some drivers 30% of fares in San Francisco and San Diego
The reality is that this is a move to dis-incentivize drivers from multi-homing, or driving for multiple networks. Think of it like a loyalty program that all drivers are automatically enrolled in. After a certain mileage hurdle, Uber’s take rate goes down, so there’s more incentive to stick with Uber even if Lyft may provide more immediate revenue.