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Exciting positive answers to this problem would be:

1) All such restaurants offering free open wifi + 2) A commercialized system that hosts the menu PDFs on tiny https servers on the restaurant's wifi router and serves them locally (potentially avoiding issues with far-away outages and also saving on the internet bandwidth for the common case).

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Now I have to connect to their wifi before I can see the menu? And the restaurant is expected to maintain a menu server? What is MORE practical about this?

No, you can use your cellular connection all you want. It'll just eat your data. If you want to trade a little effort for a little data saving, that option is open to you.

That depends on whether the @ff317's solution (2) also includes availability over the internet.

They can change prices and/or update the menu at any time and they avoid printing, storing, handing out, collecting, and cleaning the physical menus.

An appliance menu server would cost practically nothing if they're already offering Wi-Fi or use electronic POS/ordering systems.

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