Are you claiming that regular Coke and Pepsi have artificial sweeteners in them?Most soft drinks like Coke and Pepsi are sweetened by artificial sweeteners, even though they are not classified as "DIET" drinks.
Some MAY include real sugar, but not all. The simple reason is COST. When you have an industrial sweetener, such as Aspartame that is MORE THAN 600 times sweeter than sugar for the "industrial version", it increases profits.