tl;dr the company Taylor manufactures the ice cream machines to fail without any explanation or diagnosis process, then charge wildly exorbitant fees to fix them, and cut McD’s in on the profit. Some franchises found ways around this and McD’s just ordered them to stop. So the franchises just leave them broken as often as possible.
As per usual, the explanation is corporate shitfuckery.
Video explanation
tl;dr the company Taylor manufactures the ice cream machines to fail without any explanation or diagnosis process, then charge wildly exorbitant fees to fix them, and cut McD’s in on the profit. Some franchises found ways around this and McD’s just ordered them to stop. So the franchises just leave them broken as often as possible.