"Possibly because it was a mafia front. If you wanted to launder money, a fast food restaurant in a popular location"

There are many easier ways to launder money then to do it while operating a McDonalds (which has pretty high vetting for franchises. It's not trivial to be awarded a McDonalds franchise and certainly not in a top location). And most importantly if you are doing something illegal the last thing you want to do is to draw attention to yourself. Not to mention the fact that even if they were laundering money they wouldn't exactly have much to hide from pictures from a random guy with a weird head device.