Isn't that the idea?
I used to live in a place where they just don't do ice in soda at all, and it's like licking a can of dried out syrup. In the local Imax they didn't even have ice at all as an option. They looked at me like I was insane when I asked, then calmly pointed out that the soda comes out of the machine chilled. I just had to learn to watch two hour movies while sucking on a tub of lukewarm, full-strength soda like a deviant.
I can do 1L over a period of time... in a plastic bottle. If US cups are like they are elsewhere they eventually get eaten away by the liquid and start dripping, which seems to go against the implied notion that you can just order a big one and take it with you to keep drinking elsewhere.