> But there is no surplus in UberBlack, UberPop, UberX.
Not true. A lot of UberX drivers use cars that would otherwise be sitting in a garage. It may not be ride sharing, but it's still a type of car sharing.
That surplus was not intended to address the surplus of cars in general. By your argument any parking lot is a surplus that could be used for transportation.
Such surpluses are typically addressed in other ways (greenwheels for instance).
Not true. A lot of UberX drivers use cars that would otherwise be sitting in a garage. It may not be ride sharing, but it's still a type of car sharing.