That’s not true. I worked for a restaurant that was unwillingly put on the DoorDash site/app. Consumers put their order in through DD and DD would put it into our online ordering system. We had customers calling about delivery times and cold food, but we didn’t do delivery. This is even in the video - Chipotle sent them a Cease & Desist.
There’s more to the business than just placing an order and cooking food. The restaurants reputations are in the hands of these services because the consumer is interacting with the service, not the restaurant.