The ethical conundrum about robots serving alcoholic drinks. This is a very American issue.
1. Having a robot serve drinks seems to be a superficial luxury. Just so they don't have to get off their Asses and get a beer out of the fridge? Or will they be used to save money at a big expensive party where the robots will be more then mobile tables. However will it save money? Probably not, as people would probably like the interaction with the hostesses. Or would it just be a robotic bartender programed to mix a wide selection of drinks, this is the only practical use of a drink robot. But this is near the equivalent to a vending machine that happens to have drinks in them.
2. The ethics of drinking. I don't drink that much myself. (a drink every couple of months) but there isn't really a big ethical issue about drinking. It is mostly due to religions who try to discourage it. If a robot can more accurately verify someone's inebriation, it may be more helpful, to reduce drunk driving, or alcohol poisoning, better then a busy bar tender who can loose track of how much each person is drinking.