[nabla9]

Google, Facebook, Amazon all had idea how to make profit and especially how they build a moat against competition.

Uber still has not figured out how to be profitable once things settle. At the basic level it's just an app matching drivers and customers. They have little moat against other apps and conventional taxi companies adopting similar apps when price competition becomes brutal. Uber has externalized car maintenance etc to individual drivers. Taxi companies can manage their fleets more economically.