Ask HN: What is happening in the food-delivery-as-a-service industry?

I am curious what is happening here: I’ve noticed specialized tablets for food delivery services at restaurants I frequent. There is a tablet for DoorDash, Amazon, UberEats, etc. I can see how a restaurant would use such services, but when I hear that a restaurant just uses it for “advertising” their existence; or the service takes a large cut therefore restaurants have to raise prices in response to participate in the delivery-food "game"; or that staff are overwhelmed by the plethora of services, it makes me think this space is starting to have a negative affect.