They aren't not drinking because of health risks. Obesity rates among them are higher than among X-ers in their age. They aren't drinking because drinking is a social thing and they are asocial and stuck at home glued to their screens.
being social != drinking. likewise, drinking != being social
You can still be social and not drink alcohol. You can drink alcohol and not be social.
Pretty much every establishment that serves alcohol nowadays also serves some non-alcoholic alternative. Every major alcohol brand has a non-alcoholic version of their beverage, i.e. Budweiser, Coors, Busch, Heineken, Guinness.
Clear Ice DIY - free. 1 lt prebatched Negroni - 15EUR 1 lt prebatched Old fashioned - probably around 20 1 lt Mohito/Smash families - again around 15-20 1-2 bottles of not terrible prosecco - 10EUR each (good thing about Europe - a lot of the PDO wine products are acceptable quality and quite cheap) Syrups - if you use essential oils for flavoring - you could get down to 2 for liter of cordial concentrate. By using some tricks you can stretch a couple of citruses to make a lot of juice. If you home carbonate your water - it is penny on the liter - so you can spritz the cocktails to make them lighter.
You can legitimately get 15 people quite tipsy for 5-6 euro per person.
Booze in USA is not terribly more expensive - and some stuff is even cheaper so I guess a chatgpt created bar program for home drinking could get into this budget too.