I recall John Deere became infamous for trying to DRM their tractors to hell, so that only official authorized ($$$) workshops are allowed to fix anything.

Ah, yes, a bit of googling brings something up: https://boingboing.net/2015/05/13/john-deere-of-course-you-o...

I mean, if I were a farmer or had a reason to own a tractor for some other reason, I'd avoid them. Then again, the cynic in me thinks that everybody is doing this, JD just got caught and their ham-fisted PR response made it an order of magnitude worse for them.