That still doesn’t make the GP make any sense - the fancy places may have an alternative sauce by default so it’s not “dry”, as you note they’ll usually do it a

That still doesn’t make the GP make any sense - the fancy places may have an alternative sauce by default so it’s not “dry”, as you note they’ll usually do it anyway by request, and if it’s fancy enough they’re not putting ketchup on by default they’re usually not just giving the packets of Heinz. I don’t think it’s about being an advertisement for Heinz. These places often are more likely to not use Heinz.