What should Uber do, and what should Uber get for doing it? They're a virtual taxi rank. They need to do basic testing of fitness of drivers - health, driving

What should Uber do, and what should Uber get for doing it? They're a virtual taxi rank. They need to do basic testing of fitness of drivers - health, driving ability, criminal record; they need to do basic testing of vehicles for roadworthy-ness - monthly on-ramp vehicle certification; they need to maintain the app and servers. I'd imagine 10-20% take of gross would be a reasonable range. How much of that are they doing? Does any country do similar as part of their transport infrastructure?