There was a time where John deere themselves provided various models workshop manuals online but times changed to where they got really precious. I think their parts breakdown for all of their tractor models as of 5 years ago was still online.

Some years ago I was stunned to read (tractor forum) a US based farmer lamenting even though JD parts used, they'd had a third party service their tractor, and verified via diagnostics ... and basically had to wait for a JD tech to travel out and unlock their tractor so it could work. I'd assume that's the sort of behaviour that did John Deere in - travel and unlocking fees ffs.

I used to like JD, I've got one though 70s vintage.