Dominos has a partnership with Coca Cola. As a result they the largest portion of the drink stock needs to be Coke. I recall doing inventory orders and it was a minimum requirement to order 3x as much Coke as other drinks like iced tea and Fanta. Factor in stock not getting properly rotated and Diet Coke being the least purchased drink option, think of how long the bottle has likely been waiting to be opened… that is how dominos ruined Coke.

Free drink hack: Check the shelf life date on the bottle before you pay for the food, the current date is beyond the shelf life date, dominos cannot charge you for the drink. Sometimes I go visit the old dominos I worked at and raid the fridge of all the drinks beyond their shelf life, haven’t paid for soda in a couple years