Fast-food chains incorporate customer-created menu hacks into their menus and marketing.

Fast-food chains embrace menu hackers' creative combinations, with Harvey's marketing director keeping a list of customers' unique food creations. These combinations, such as adding pie or mini doughnuts to milkshakes or onion rings to hotdogs, showcase customers' creativity. Fast-food chains are using these popular menu hacks to shape their menus, marketing, equipment, and training.