There's a reason why you upgrade to the large fries. It's because you want you some fries! Or you know your friend is going to mooch heavily off of you, despite the fact that you asked them if they wanted their own fries (classic friend situation). I would argue that the fry cup is not the best way to maximize your fries. They are liable to fall out of the top. Why else do you always find some in the bottle of the bag? The best conveyance for fries would be a big garbage bag.
This pictures shows the perils of the fry cup. Those are the exact same sized servings of fries! How dare they? The next president I vote for better run on the platform for wider fry cups. It's the only way to seek justice in the fry world.