I don't mind this when it's done well. I'm going to have to mess with something to find out what food the restaurant sells and my phone is about as good an option as any. It can allow easier menu changes, inclusion of specials, and the like.

In practice, however most restaurants seem to go for a PDF of their previous menu design formatted for printing on a paper many times the size of my phone. That's a bad experience and restaurants that do it deserve to lose business over it. I'm reminded of about a decade long period not long ago when a restaurant website was more likely to have animations and music than the hours and menu.