In India, these are called "cloud kitchens." A single cloud kitchen could be listed on a food delivery app under multiple brands - one brand for chinese cuisine, one for italian, etc.
There are 'cloud kitchens' im California that have 30 to 40 "kitchens" at the same address, different apps. The largest on just has a double stove and cooks meat, side by side as the most kitchy vegitarian meals. The two roast beef sandwiches cost less than the salad, but the delivery driver could not hand us the food on premises. We walked outside and we're handed the meals. ( The vegitarian salad was in a separate bag ).