Suppose you are about to travel to some unfamiliar city, perhaps abroad. You don’t want to just show up without being informed or you might overlook some great restaurant or bar. In principle it would be useful to have an app that visits the websites of all (or select) restaurants in your destination city before you go. It could harvest all the PDF menus.

The train or whatever mode of transport may not have wi-fi, but having an offline collection of PDFs can be a good way to get informed offline and decide where to go.

If such an app would exist, restaurant owners would be encouraged to post PDF versions of their menus on the web.

The list of websites could be grabbed from OSM. Restaurants likely have to be licensed in some way by the gov or hygiene regulator, which could also be a source for website URLs (not sure).