Dear Queenie,
In a small restaurant I go to, I noticed a sign that said not to bring in food from another place to eat it there.
Queenie, why do people do this? Isn’t this cheating the owners of the place where they eat?—Restaurant Etty Ket
Dear Etty Ket,
Unless the person also purchases food or drink at the place where they eat, yes, it is an imposition on the proprietors of that place, who have to pay for things they use, like napkins, and for cleaning up after them.
As for why they do this, I have no idea, unless it is because the place where they obtained the food has no facilities for them to eat it there. I would suggest that they purchase their food at places where they can also eat it, or take it home to eat.