Just a shower thought, but if the car makers can make self-driving cars, can't they also implement their own versions of Uber ? Why would they even sell the ca

Just a shower thought, but if the car makers can make self-driving cars, can't they also implement their own versions of Uber ? Why would they even sell the cars, when they can rent them out and make much bigger margins ? Uber's current strength is it's database of drivers, but since we're talking self-driving cars here, that become irrelevant. It's not like Mercedes or BMW lack brand recognition in the transportation space...