The point of Deere defending their market would be to make it as expensive as possible for outsiders to take. There's no way they would let a billion-dollar rev

The point of Deere defending their market would be to make it as expensive as possible for outsiders to take. There's no way they would let a billion-dollar revenue stream go for a few million. Just look at how much money was spent in the Google v Oracle lawsuit over Java APIs. Plus, if Deere won, they'd come at you for damages, which would get expensive very quickly.