You're assuming that driving cars is an ultra-tight labour market. That's not a correct assumption. There is a relatively limited number of cars you need to hav

You're assuming that driving cars is an ultra-tight labour market. That's not a correct assumption. There is a relatively limited number of cars you need to have good service compared to the number of people looking for unskilled jobs in major metro markets, even when unemployment is low in percentage terms. If Uber was hiring an army of specialists maybe I'd agree but loads of people can drive.