McDonald's is still cheap but only if you use the app for deals and points. They want to drive people to the app to eventually hire one less employee at each store, which will save them more money. They keep the app cheaper to drive this change.
I think it may be targeted though. My friend who is on the road alot and eating fast food always has 30%+ off McDonalds coupons in the app and never any Uber Eats coupons in his app. I order more delivery and always have Uber+McDonalds coupons but my app only ever shows $1 Hash Browns and $5 Chicken nuggets box which I always thought was normal price.