They're extraordinarily rare in recipes for sure, basically only in old ones.
But if you buy a 'cups' measure it ~never says which of the four it is, and it may well be there old Imperial size. (I have one. Was a popular one on Amazon, nothing obscure.)
A recipe given in ounces and pints might be using Imperial or US ounces and pints, but a recipe in cups is American.
(It can matter when something is in another unit, like "4 eggs".)