And then the corporate lawyers seek out more insidious ways to fuck over the customers. Droping the exploitative brands is the only way to force them to change their ways.
And I'm totally not shilling for Zetor.
As I recal JD is very anal about third party implements, any repairs can be done only by their repair service, everything else is a breach of contract (not even warranty) and you are not allowed get spare parts on your own.