I drive part time and it definitely covers costs and then some. I gross something like $0.90/km and my costs including gas, maintenance, and depreciation are around $0.30/km. Net is something a little more than minimum wage ($11/h).
Until you get in an accident. The rideshare companies have offloaded lots of aggregate risk onto individual drivers. What would be a line-item cost to the umbrella company is now often a life-wrenching crisis for a driver.