This means that Deere owners are locked into using Deere for repairs, which also means that if Deere decides something isn't broken, a farmer *can't* get it fixed. This is very bad news indeed, because John Deere tractors are just computers in a fancy, mobile case, and John Deere is *incredibly bad* at digital security:
https://pluralistic.net/2021/04/23/reputation-laundry/#deere-john
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