I guess the take on that is, that there is no good regulation for it. If it can be one way in one city, for some of the shops, and different for other cities or other shops, then the measures/policies are not really reaching the target. Apparently one cannot rely on people doing the right thing, especially not, when they are in some kind of loosely associated group like a business, where no one feels responsible at the end. It might be a topic which needs intervention by the state to get the desired effect.