Disgusting hygeine and food handling practices.
The downfall of these fast food places is WHO owns so many of them. Hint: They’re immigrants from a different culture and they don’t use toilette paper.
I live mainly in a white population area and do not know about that but what cinched it for me was looking beyond the counter people and looking in the food prep area to see who was actually making the food. Greasy hair, tat's, piercing all over their face and generally looking less than savory.