https://www.vice.com/en_us/article/v7m8mx/john-deere-promised-farmers-it-would-make-tractors-easy-to-repair-it-lied

In September 2018, a trade group that represents John Deere and a series of other tractor and agricultural equipment manufacturers made a promise intended to stave off increasing pressure from their customers and to prevent lawmakers from passing what they said would be onerous repair regulations. They vowed that, starting January 1, 2021, Deere and other tractor manufacturers would make repair tools, software, and diagnostics available to the masses.

This "statement of principles," as it was called at the time, was nominally designed to address concerns from farmers that their tractors were becoming increasingly unrepairable due to pervasive software-based locks that artificially prevented them from fixing their equipment. As Motherboard repeatedly reported at the time, farmers were being forced to go to "authorized" John Deere dealerships and service centers to perform otherwise simple repairs that they could no longer do because they were locked out of their equipment and needed special software to unlock it. To get around this, some farmers had begun hacking their tractors with cracked software from Ukraine.