When somebody wants to buy a good, if the only way to do that is to accept a one-sided ToS that makes them give up there rights, that's just eroding freedom.
The problem is, it's not a choice anymore. John Deere isn't saying "hey, want to sign up for our repair program?"
It's saying "If you want a tractor we actually control what you can do with it forever. Too bad you need this tractor to work, tough luck we own you"