As I understand, it tends to be profitable in cities where it has operated for longer time, but it operates at a loss in cities where they've entered more recently due to costs related to marketing for driver acquisition, customer support, fraud, etc while ramping up the fleet size and establishing a stable physical presence.

As for drivers, my anecdata is that many claim to make "good money" (in their words). I've had a guy say Uber doesn't make him money, but then he followed up by saying he's a retired guy just doing it to keep active and that he owns two convenience stores...