1 McDonald's
2 Wendys
3 KFC
you put portillos on a tier list and they're like 90% in Illinois
same with culvers but the great lakes
so yes
(also your tier list is true and fact checked by another true Illinois patriot 🦅🦅)
if you've ever had Andy's Frozen Custard, I'd put that first and move the rest down one unironically (including homemade)