I’m not sure if this has a factual answer or not, but I’m going to ask anyway.
I’m a diabetic, meaning that when I got with my family to eat out at almost anyplace on the map in the US, I’m stuck with three choices to drink: Water, diet Coke/Pepsi or iced tea.
Is there a reason why I can never find other diet sodas, like Diet Sprite/7-Up, Diet Dr. Pepper, etc? It drives me up the wall that I have so little choice when I go out, even in places that have full bars, they never have fountain diet sodas other than Diet Coke or (ick) Diet Pepsi. Seems that with the rise of diabetes in the US, you’d start to see more choices that are diabetic freindly.
BTW, The Only exception to this that I have ever found is A&W, which serves their diet root beer.