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 ...