The small distinction is that diners are inspected and I doubt that many of them have pets running loose in the kitchen.
And you trust the inspections? The same people cooking in the diner could have the same “children” at home. Sometimes the rationalizations crack me up.
Inspected once a year; and their ‘pets’ are liable to be of the feral, verminous variety.
And that is whether it’s a hotdog cart, roach-coach, fast-food joint, a diner, a ‘family restaurant’ or a ‘fine dining’ establishment.
Franchised is no guarantee, either; think “(W)affle House”.
Not unless you count the mice/rts that most usually have a problem with, same with grocery stores.