What are some alternatives?
FlightCar - Free airport parking by renting your car to fellow members
Getaround - Rent exotic cars near you, right from your phone.
Uber Bus - Uber's latest venture, book a bus
Care by Volvo - Have your own car, without the hassles of car ownership
WaiveCar - The world's first all electric and free car-sharing service
WeShare - A new electronic vehicle sharing service from Volkswagen