In the US, there’s a concern that some alcohol company will start claiming their drinks are healthier than the others, so alcohol packaging isn’t required to say anything about the number of calories in the drink ( https://www.eatingwell.com/article/2052030/why-your-booze-do... ).
It makes me wonder how many people see that calories aren’t listed and assume “it must be small.” I don’t think anybody believes alcohol is a diet drink, but I’m sure many people don’t realize how it’s packed with calories.