Just my POV: A question - would you ever bring some supermarket food to a restaurant anywhere in Europe, or let’s say, Germany, and ask them to cook it for you? Honestly, I don’t believe so. I just find it really disrespectful and impolite to bring some outside food and ask local restaurants to cook it for you, which of course they will do, whether it is to retain you as a customer, avoid a bad Google review, or just to please you, because they are the ones who have been suffering a lot recently and every dollar matters to them. So they can’t just say “no” to a foreigner. But from my point of view it feels like you just use your privilege as a foreigner. Especially, if you answered “no” to my first question, then what makes you think it is okay to do so here?