I didn't "just tell him to switch to Linux". I based my advice on Windows 10 and told him if he really wants a LTS system (because Windows 10 can only be used this way in the more expensive Pro version), he COULD switch to Linux. It was a side note, and it was in a nice tone, AFTER my Windows advice. Hows that malicious advice?
And I disabled the parts I considered "spying" on my Windows 10 install as well. It has been proven that the NSA broke into DataCenters of big internet companies or used National Security Letters to make them give them their data. Maybe it is paranoid, but my country had two periods in the last century where having your data leaked could have SERIOUS IMPACT on you or even your live. That's why most people in my country value their privacy very much.
And if you don't update your work PC, that is even worse. For most companies I work for this is even grounds for termination - and I agree.
Edit: Oh, and the guy claiming Ubuntu is spyware: if you mean the Amazon search bar, it was only in the Unity version and it's long gone. Most Windows switchers would be more comfortable with KDE or Cinnamon anyways. I personally prefer the Arch-based Antergos.