it's the lock-in petrol/gas app to me -if one 7-Eeven out of the 5 in the radius the app picks up has cheaper petrol than the one you're currently at, the current location will honour the discount (up to 15c/litre off anyway) and our closest 7-Eleven is usually the most expensive hence i think of the petrol price lock app.
i don't think i've ever had a slurpee and they don't interest me (there were never any near us growing up, some of my daughters friends thought DH and i were terrible parents in that she'd only ever had 2 slurpees in her life in senior highschool and both were when she was out with other friends; i'm 100% sure DS has never had one in his 15yrs of life and even though we go for petrol when we need it, i don't usually buy anything else in petrol stations regardless of their deals but they're one of the few places that do Krispy Kreme here so that's the other thing my DD would associate with 7-Eleven).