There's also these weird remote countries nobody has ever heard of where 1/3 (estimate, but more than 10%) of restaurants only take cash, paying amounts < 5$ st

There's also these weird remote countries nobody has ever heard of where 1/3 (estimate, but more than 10%) of restaurants only take cash, paying amounts < 5$ still grants you a weird look at best, a nope or wtf at worst - and there are in general a ton of shops (bakery, butcher's, boothes, vending machines, etc) that don't take anything but cash, and usually still can't change a 50 :) Oh, by the way, one of these countries is Germany.