the family operated kitchen on Main St. has rent, fire codes, safety equipment needs, some form of sanitation code/inspection to pass with the city.
Uber Chef ignores all of that and bypasses all overhead - you don't need a restaurant or even the physical location of a building to employ chefs to cook food. No need for health inspections or expensive fire suppression equipment. (you use people who want to rent their home kitchens out for cooking)
That's Uber's raison-d'etre - to bypass all legal restrictions and externalize all overhead in the way of getting the items to you.
This isn't a joke, this is what Uber did with their taxi service at the beginning as MVP so why not do it to food services as well?