The food delivery services are not profitable. They’re like Uber and Lyft, funding money-losing services with investment capital.
Roy’s friend was first annoyed to discover that DoorDash was providing delivery services for his nondelivery pizzeria: taking web orders without his knowledge, phoning in for takeout and sending a DoorDash delivery worker to pay and pick up the food, and often delivering to a customer who would be annoyed that the pizza arrived cold. And then he was surprised to see DoorDash was selling his $24 pizzas for only $16. This meant he had an arbitrage opportunity: Order his own pizzas at $16, sell them to DoorDash for $24 each, and pocket the difference.