I think it's what you're pinpointing in your last sentence that's the "screwing your other customers" part here. I don't have a problem with the concept of preferred treatment, but to me, that would be "if I search for a given category, put the preferred partners in that category first in the search results," but -- as you say -- a click for a specific restaurant should probably take you to the DoorDash page for that restaurant. At the very least it should take you to a search page that puts that result at the top.