going to macdonalds twice a day is definitely riskier than getting groceries at the supermarket once a week. most of the food is packaged, and the stuff that isn't can be thoroughly washed before eating it. even for the stuff that isn't packaged and can't be washed, coronavirus isn't known to last longer than three days, so you can just buy it and let it sit.
contrast that to the multiple different staff preparing your food, which you then immediately stick in your mouth.