I Japan, with their obsession about cleanliness, I can imagine that those tablets are thorougly wiped between each customer. But not in other countries.
Good point, I'd only suspect harder to pick up residue from the porus paper than the smooth glass, and if the paper is made of wood then that is antiseptic by nature. It is true I seen paper menus I did not want to touch, it was replaced so long ago having sample of the food selection and the previous guest's choices on them plenty ... : ) At least some of those one paged ones work just by looking at them in contrast of touch devices mandating the tap and swipe to present things.
I am not aware of that aspect at all, but cleaning and cleanliness is in focus in general, from childhood, cities are more tidy even by look and the sight of the lady washing up (properly, with water, sponge, having a custom belt with containers for the tools and liquids used in the process) the sidewalk after cleaning up the poo of her dog is burnt into my retina.
Certainly there is a social pressure to clean and keep social order. It is one of those things that as multiple layers though, the streets are usually clean, people generally fall in line and don't make a mess but it does not mean everything is clean (like commercial kitchens).
