Well that’s a great way to have a customer come exactly once to your place and order something small and cheap and then never return out of bad memories and embarrassment. It’s also a great way to make a name as “that restaurant where you’ll get ghosted” for yourself. For real, either the place would get a bad rep as a cursed place, or (more likely) they lose valuable potential customers because they will never go back to a place where they have been stood up.