Hi Raffey - that's a good question certainly - I've not found anything online to suggest that they were the only food vendor in those 27 retail locations (not built with public funds or tolls).
Believe me, I've no great love for the franchise - except for the fact that I can use it as a reward for my teen - 6 days a week anyway!
Trying not to do the maga thing of overreacting to a thing that's not much of an issue is all.
I would certainly make this an issue with any future state business with Applegreen (who runs the service areas now) Did they kick out a legacy food provider to make room for the chicken folks?