...and last I heard, Uber had a very high (>90%) annual churn rate in drivers, so if their flow of new victims slows (like a virus up against too high a percentage of the population with immunity now), they may not turn out as well in the end. It might suggest why Uber is maybe pushing to get self-driving cards as fast as possible; they may know they don't have all the time in the world before the current model stops working.