I love doing that! So much so that for me true lemonade is just carbonated water and lemon. I do it with oranges, grapefruits and strawberries (mashed)

Lemonade for me (and google) is a homemade recipe with lemon + water with or without sugar syrup, I guess it depends on the country. I also never see Sprite at parties... just Fanta, Cola and our sodas

It is also next to other normal lemonades like it belongs there and not in the "coffee" section.

Having the drink available in the soda fountain next to normal drinks is overall a bad idea both for kids and unknowingly customers (also ~400 calories for a lemonade is madness). The adjective "charged" doesn't make me think "with caffeine", it should be called caffeinated/energy lemonade in big font like redbull does, not with some abstract marketing adjective.