Funny enough, I think I get the McDonalds cheeseburgers thing.
Years ago, when the Dollar Menu was new Double Cheeseburgers were in it (then they went to McDoubles to save a slice of cheese, then raised the price of McDoubles).
Hamburgers weren’t, and actually cost more. So people who wanted a hamburger (or a double hamburger) would order the Double Cheese burger without the cheese ...