If it's a restaurant that updates its menu often, this keeps them from having to spend money printing the updates/specials/any weekly changes. Also, if you're someone like me who's starting to have trouble reading small type, especially in low-lit places, having the menu on your phone allows you to zoom in so you can see the menu and don't have to use the light on your phone so the whole place knows you're an old. Not to mention, now I don't have to ask or wait on some teenager to bring me the menu. It's there any time I want it. Thinking about dessert? Don't have to ask. Can't remember what that second cocktail was that you were going to order? Don't have to ask. Plus, it's more sanitary. Now I don't have to touch a menu that 100 people have touched throughout the day right before I use my hands to feed myself.