This is completely unbelievable. I know a certain number of people in the wine business, and without exception they ship UPS and require an adult signature upon delivery. In case you hadn't looked, the cost of shipping is high enough that it's only worth online orders for high priced stuff, ten bucks a bottle and up. the typical online order is a hundred bucks or more, hardly attractive to kids.
And that's your answer. The wholesalers currently have a stranglehold on alcoholic beverage sales in the US, with a three-tier system from maker to wholesaler to store. The wholesalers realize that the value they provide is vastly less than the high markup they command, and they are desperately trying to kill online sales and anything else that will allow consumers to avoid going through them. Hence this totally bogus survey.
R's,
John