Not a reasonable comparison. You might as well have said "you have to BUY a car, so it's not FREE". Yes, you have to buy, register the car, and learn how to use it, and obey the laws of the road. But they allow a kind of mobility that is impossible for Europeans and other jelly-kneed metrosexual weenies to enjoy. Owners of cars don't have to organize our lives around where train stations are located or anyone else's schedule.
Driverless cars, on the other hand, aim to "tame" the automobile and make it a kind of mini-train, with someone else deciding where you may go and how you may get there. Google is already creepy enough without handing over your freedom (and privacy) of movement to their computer.