The average Burger King, etc is so small from a travel distance point of view it doesn't have any protected routes, so that's a bit unfair....
Back on topic, most "kitchens" in offices & shops these days are nothing of the sort with only kettles, microwaves, etc and are only slightly higher risk than any other area, such as the offices, copier room etc, that are also chock full of electrical ignition sources and if anything some if these kitchens have less readily combustible materials nearby - a faulty overheating microwave that then flames is less likely to have anything next to it to rapidly spread the fire than a copier area that despite the need for good house keeping will be chock full of reams of copier paper, cardboard paper recycling boxes, etc