It seems like a no-brainer, but the restaurant business is a cutthroat, low-margin tough slog and a lot of that comes from the cost of parts (i.e. food) and lab

It seems like a no-brainer, but the restaurant business is a cutthroat, low-margin tough slog and a lot of that comes from the cost of parts (i.e. food) and labor, not just the storefront. A delivery-only restaurant still needs to deal with hiring staff, sourcing product, health inspections, purchase and maintenance of equipment, etc. That's before the whole delivery thing comes into the picture. If you want fast service, you have to scale up the staff and get some decent logistics in place. I suspect this would only be profitable via automation. But that will probably happen soon.