The article mentions more than farmers using the data. Not sure how anyone can take you seriously when the first paragraph mentions oil companies using the data as well..
It's fairly simple to keep these devices isolated and if you have a decent firewall, you shouldn't have much to worry about. Keeping them in a separate, internet-only VLAN with peer to peer isolation is typically the standard protocol. That said, in a lot of cases, even keeping the isolated doesn't resolve any privacy concerns. Also, with some devices, you have to open up mDNS.
I was into machining right out of high school. After layoffs and plant closings I got into IT, now networking. I’d never make the kind of money I do now if I hadn’t of made that career change! I love my job too.