My favorite regional 'fast food joint' is "Cookout" (NC/Tenn). Not only is the Big Double Tray a fantastic & delicious value... they have a hand-washing sink immediately next to the ordering line (so you can wash your hands while waiting).
One could call it an unfunded mandate for public availability of restrooms. Not that I find that to be a bad thing.
I noticed in Denver a number of places that had gone out of their way to remove seating specifically to avoid having to offer restrooms to the booming homeless population in the urban center there.
I'm sure governments like the idea of not having to build-out public bathroom infrastructure (which gets a lot harder in places that freeze).