Because if your car has broken down, or you're exhausted from a long day of work and your family is hungry, or you're too drunk to safely drive but still want food, or if you straight up don't have a car and don't want to cook that night, or you are on vacation at a hotel or airbnb and don't have other access to food, or you have a baby that you can't just leave alone for a few minutes to go pick the food up, or you are in the middle of a study session and it would be more convenient to have the food come to you rather than going to get it.
Looks like there's lots of reasons people might take advantage of the service that can deliver food to them, and it's not unreasonable for them to expect that service to not completely fuck it up.