I see a lot of Sbarros at airports. Which is absolutely not to say they're not struggling - they probably very much are - but only to say that they're not a mall-only place.
FWIW this isn't necessarily indicative of the number of ones in airports. For example "Istanbul Havalimani H-42 HPS Sbarro" only says airport in Turkish and "Aeropuerto Los Cabos" is in Spanish (though maybe these are the exception, not the rule).
Looking at it further, it does go both ways as well - for example "Gurnee Mills" is in a mall.
There also seem to be a surprising number of Sbarros outside of the U.S though they are all listed first in the list.
It was my first taste of European pizza. It had no tomato sauce inside it. I went to the staff to signal that I wanted sauce in the pizza and they had no clue what I was saying.
That day I came to the shocking realization that that's how the rest of the world ate pizza.
Sbarro seems to have redone itself in the last few years so I’ll renounce my previous hatred but I have an unreasonable affection for Orange Julius, even if I have to sit in a DQ drive thru. It’s unpretentious and undemanding. The Jeffrey Archer novel (ok maybe I should say mindless instead of unpretentious) of drinks.
A car oasis that used to be along my commute has a Sbarro that serves breakfast, and it's pretty great. Scrambled eggs, sausage links, potatoes, and several different breakfast calzones. I often stopped there in the mornings.