TL;DW: there are some perverse incentives to keep them broken. Basically the owner operators are forced to use a particular brand by corporate. Corporate McDonalds has a deal with a particular ice cream machine company. That particular company is the only company owner operators are allowed to buy from, and the only company allowed to service the machines. And it's no skin off of McDonald's back for these machines to always be broken, the cost falls on the owner-operators.
TL;DW: there are some perverse incentives to keep them broken. Basically the owner operators are forced to use a particular brand by corporate. Corporate McDonalds has a deal with a particular ice cream machine company. That particular company is the only company owner operators are allowed to buy from, and the only company allowed to service the machines. And it's no skin off of McDonald's back for these machines to always be broken, the cost falls on the owner-operators.