IMO, those stands are as much of a shop, as vending machines.
Those are not tagged with shop=*, but with amenity=vending_machine and vending=*. Ideally, one would combine those under a single umbrella term, and could specify whether it is automated or not.
This might be a new proposal though and I do not know how people would feel about this. Thoughts?
Alternatively, amenity=vending_booth and vending=* could be a good option.