Imagine there are only 2 brands of cars, and one of them disables the engine as soon as the driver wants to enter your drive-thru. Imagine also that this car brand operates a chain of drive-thru restaurants that their cars will happily visit. Now extend this scenario with the fact that there are more and more types of food you can only get through drive-thru restaurants and old fashioned restaurants don't offer these anymore (because most people now expect all food to be provided by drive-thrus).