I agree with the spirit of your comment. As a counterpoint, the NYC subway began as a private enterprise. A big point missing from this comment thread is that w

I agree with the spirit of your comment. As a counterpoint, the NYC subway began as a private enterprise. A big point missing from this comment thread is that we may be conflating "private business" with "private (personal-ish) vehicles," where personal vehicles obviously can never have the capacity of, eg. the NYC subway. Personal vehicles are just plain all around bad for moving large numbers of people. I'm not sure Uber with its motto "Everybody's private driver" is the right private enterprise to deliver privately operated mass transit that is healthy for our cities.