Exploiting a business partner that is operating at a loss is a bad move when said partner is providing a significant part of your revenue. You are placing that revenue in jeopardy without good reason.
But in the McDonalds/Uber case I don't think that Uner is imortant enough to McDonalds.
How does the product/revenue work when McDonald's are all franchises - does McD corporate have a first-order incentive to worry about delivery revenue?
But in the McDonalds/Uber case I don't think that Uner is imortant enough to McDonalds.