Is there any farm equipment (from China perhaps) that isn't DRMed? In addition to discussing the responsibilities of vendors, maybe we can also discuss the responsibility of customers to understand what they're buying.
In this case their general lack of effort around security (see the whole IoT mess) may be a good thing, as it means any DRM is more hackable.
The flipside of that is the firmware may also be buggier, but then again, you're also more likely to be able to fix those bugs due to the hackability. The old Douglas Adams quote comes to mind: "The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."