In the long term, perhaps. But all of these companies are burning VC money in hopes of getting enough market share that they can dictate terms. Or at least justify yet more VC investment. In the short term they are getting away with quite a bit. E.g., once you take expenses and lost time into account, many DoorDash workers are losing money: https://www.salon.com/2020/01/19/doordash-drivers-make-an-av...