@pluralistic
John Deere also links essential running components to nonessential components.
Hutterite colonies try to avoid modern things like music and the like. When I worked at a JD dealership, a Colony had all the radios removed from the new combines and tractors and they went in the Minister's safe. The workers bought 3rd party radios and tried to install them. Chaos ensued.
Removing the radios required a re-program of the machine along with a check and approval from JD. When the boys tried to install the 3rd party radios, the machines wouldn't start. They wouldn't even initialise the computer boot-up.
It was a month of diagnostics, back and forth with Deere and finally a workaround so that the equipment would run without the radio and sneakily run the 3rd party radios for the boys who weren't even supposed to have them in the first place.