It’s common in restaurants, but not so much in supermarkets. I think the biggest/most well known supermarket that franchises is sav a lot.
Safeway, Kroger, King Sooper etc are not and in fact own multiple brands. Kroger for instance owns not Only Kroger stores but Fred Meyer and King Soopers and a few others.
They’re free for the pickings as far as I’m concerned along with Walmart, I might not steal myself but I’ll be turning the other way rq if I see someone else doing it