Although I don't think they'd want to compete directly with Uber... surely they'll want to do something with their self driving car technology some time in the future.
So if it is a Trojan horse like the gp poster suggests it will be built with blocks of cash for the founders and investors instead of wood and filled with war crazed Greek soldiers.
Uninsured, automated gypsy cabs. No danger there.
Or, sharing the ride with three other commuters could bring the total cost of ownership to ~15 minutes per day.
While the cost will initially be higher, it likely won't be much, and will eventually be negligible.