Earlier quoted context omitted.
This page has a section titled "Cups, Not Calories". It hurts my soul that anybody producing a table such as that is using something as vague as a "cup" in their calculations.
I think "cup" is one of these American units, it's about 236ml
American legal cup ? metric cup ? Canadian cup ? or one of the other ones.
Even if you narrow it to just the roughly the US you still have 4 + metric , so 5 different options.
and that doesn't even account for people just using the cup they have to hand.
It's not a rant at you, it's frustration with non-specific, arbitrary units.