looking at the pricing(at least for mcdonalds), they did the typical increase the price of everything to compensate for the new deal. Like double cheeseburgers are almost 5$ now that way they can compensate for being able to potentially sell 1 for 1$

Not to mention only 4 items on the menu are valid for it, and none of them are still worth the price. It's hard to justify 2 for 6$ of something that used to be sold at 2 for 3$ just last year.

being said I guess it's better than nothing but, I still don't forsee me going to a McDonald's any time soon