In lots of countries, when you get your food, you get only 1 or 2 napkins. There's a weight-based trash fee in lots of countries, so for a small cafe or restaurant, with lots of traffic, 1 vs 3 napkins per person adds up costs. And paper products aren't cheap everywhere, unlike the USA.
I grew up in such a place, so did my wife. Our kids know, when you get ice cream, use only 1 napkin. No need to crumple each napkin after single use. Fold and turn.
Yeah, if we're given a bunch of napkins, they end up in the car, for future use. Food service businesses throw unused ones away, due to health/compliance rules, which I accept.
Otherwise, it's stupid to dispose unused paper products and un-Mustachian too. Facepunch-worthy behavior.