I'd be surprised if they weren't running out of restaurants. If you're already running a restaurant, adding a handful of extra covers a night and paying somebody to deliver them locally isn't going to drive down your margins (and probably will drive them up, assuming you get enough orders to cover the driver cost).

If you can outsource your driver to somebody like Deliveroo or Uber Eats, even better ...

If you outsource, service goes to hell and you lose business. Contrators of contractors just dont care about you or your bottom line. Most successful delivery services are hyper local, or pizza.

I’ve used DoorDash and Grubhub quite a bit. They’re both quick, reliable, and generally seem to care more than your average pizza delivery driver. The drivers will typically go out of their way to make sure you get your food on time and still hot. Maybe it’s just my area, but I’ve mostly switched from restaurants that self-deliver to these two companies.

While that sounds plausible it doesn't appear to be compatible with the success of Just Eat, for example, who are doing awfully well ...