Their self driving cars do work? I rode in one for 30 minutes one-way on Sunday. Used it for my return trip too. No driver. Take at least 2 - 3 rides a week and have been for a few months now.
Or perhaps my threshhold for “scalable” takes different parameters and weigh these inputs differentfly from you.
If they work out how to deal with, say, New York weather conditions, there's potential, but they don't seem to be any closer.