[theorique]

Does anybody really think of Uber as "ride sharing"? I think of it as "app that calls you a black car cheaper and faster than if you went through a car service".

Some of these like Lyft or RelayRide are truly car sharing - peer to peer facilitating hitchhiking by unlicensed "cab drivers" for tips.

But still, the "economy" part is more in evidence than the "sharing" part. Obviously, people expect to be paid for doing services, even if it's an informal and off-the-books part of their income.