On the face of it, McDonald's corp should also be harmed by this. It makes their customers less successful through higher costs & lower sales, and it tarnishes

On the face of it, McDonald's corp should also be harmed by this. It makes their customers less successful through higher costs & lower sales, and it tarnishes their brand when a customer of their customers is unable to purchase an ice cream. The two questions in my mind after watching: 1. What makes McDonald's corp okay with it? 2. What is the difference between the arrangement with McDonald's and the other franchises/chains? (Wendy's, In'n'Out, etc.)