I haven't looked at a McDonalds franchise contract, but every QSR franchise contract I've seen requires the franchisee to pay the brand a percentage of each location's gross sales.
Broken ice cream machine = less gross sales. Less gross sales = less money going to the brand.
It's also not great for customer satisfaction.
QSR franchisees are famous for cutting every corner they can get away with (as well as cutting even more corners until they get caught by the brand or local health/labor inspectors), so maintaining quality and consistency is a very real concern for these brands.
Yes, that could explain why McDonalds execs would try to discourage franchisees from using Kytch.
It doesn't, however, explain why McDonalds execs seem not to have a problem with 20% of their locations not being able to sell a product that people apparently like enough to complain when they can't get it, which is what the top-level comment was talking about.
It's surprising they cannot build a machine that does not break that easily.
They're fleecing the franchisees via repairs.
The repairs are handled by local distributors of Taylor machines. Taylor itself makes money on replacement parts and machines.
There haven't been any allegations of kickbacks to McDonald's corporate, so I don't get it.
So no, it doesn't mean less gross sales.
me: "I'll have a milkshake please"
McD: "ice cream machine's broke"
me: "ugh. Ok, I'll just have a coke"