As has been said - these are Freestyle Coke machines. Which means you get about 100 different Coke options. Then you can mix and match those Coke options into one drink. So think about it. One person. 100 Coke options. A person who is in Disney World and can't usually think beyond the usual menu choices. Now they have 100 options.
BUT WAIT!!!!!!!! You can now COMBINE those 100 options into whatever you want. So, the math whizes, how many options are those? And then you will have the parents who will have their kids make those choices? "Gee Jimmy, what do you want? The Brazil mixed with the Israel? Oh, you don't know what each one tastes like? Can we take a moment so Jimmy can sample each of those? *turns back to the person who knows they only want Argentina and Costa Rica* "so sorry, it'll just be a minute". Jimmy now determines he doesn't want either one of the original choices so goes back to the original point (not literally, he's still standing where he was before) and decided on two other choices but he's not tried any so we have to repeat everything. So Jimmy is finally decided but now Mary, his little sister, being bored beyond belief, comes over and Mommy wants her to have her shot (pun intended) so the nice Disney Cast Member lets her go in front of Mr. Argentina and Costa Rica. And the line grows on and on and on.
Like I said, Fast Passes for Coke Free machines at Disney World. It's Disney World, not anywhere else. Only if a fee were charged and then we'd be hearing about that too.