In LA at least, I can get Indian, Mexican, and Thai food delivered as well. And salads, if I really want to waste my money. In call cases, deliveries are by the restaurants own delivery staff.

And higher-end restaurants generally don't deliver at all, on any delivery service* because the quality of the food can be diminished during transit. Some have made exceptions during the COVID19 lockdowns, and some have simply closed down for the duration.

Or you can, you know, get it yourself. Also, most high-end restaurants didn't do takeout nor delivery before the pandemic.

Not all food fits into the delivery model, burgers will get soggy, toasted sandwiches will get will get cold, salad will be cooked by the warm ingredients, ice cream will melt. For the most part if a food is good delivered then there were already restaurants offering delivery of it.