From the position of one of the apps connected to the Deere Ops center - https://geopard.tech/johndeere (250ac free) - JD doesn't provide any opportunity to get private farmer's data w/o explicit farmer consent. There are very concrete and strict rules on how the data can be accessed/shared https://docs.geopard.tech/geopard-tutorials/product-tour-web-app/john-deere/john-deere-operations-center-data-sharing

Even if the data is shared, each app connected to the Ops center has signed a license agreement - data can't be resold in any form. 

As for Deere terms - as stated above, you need to check their terms, usually software (in this case Deere is a software vendor) always wants to have a bit more in terms than they use (just for the future, you never know). I'm not aware of any deal between Deere and any ag input company (if it would happen, there would be rumors, supply, demand, and price for this data). 

IMO they are building smth similar to Apple in ag data, and you can't go with a short-term strategy of selling data with this long term strategy. They are good with machinery sales.