[kitd]

The difference is that apps are in competition with each other and the app store is more like a marketplace for developers. There is no physical interaction between developer and buyer.

Uber could never call itself a "marketplace" for drivers. It operates much more like a driver agency.

Edit: there are genuine online booking agencies for drivers in London, like http://www.kabbee.com, which act as a front-end for independent minicab drivers. I think this is much more that way it should operate if the drivers weren't employees, as Uber argues.

[beojan]

It looks like Kabbee is a front-end for minicab firms, not drivers.

[Natsu]

Drivers are in competition with one another in a way, though, in that any given passenger can only ride with one of them at any given time.

[grouchoboy]

But they can not decide the price of their service. I think this is a great difference.