Comment by supernovae

I don't have the answer as it pertains to Uber, but the "marketplace" approach to things is pretty universal.

Ebay fees are upwards of 10-15%. Amazon fees can be as high as 45% Apple's app store fee can be 15 to 30%

Uber wants to get you coming and going by charging a Sub on the front end and splitting fees on the backend... it's like the worst of capitalism