Vending machines
I’m slightly confused by this poster’s questions, as I’ve seen lots of vending machines in European schools too. Perhaps the Twitter user is from a different part of the world, where vending machines haven’t reached yet.
Some American schools do have vending machines in cafeterias in case students need snacks or don’t like what is on offer for lunch that day. It seems pretty sensible if you ask me, and not really that weird.