I have a stack of PC Magazines back for ages at the top of my closet. On one of them, there is a caricature of Bill Gates as an octopus, fighting off attacks from fighter jets (the lead of which was Netscape) because Microsoft had the audacity to ship Internet Explorer as the default browser in their operating system. Let me repeat that: The fact that an operating system used it's influence to set the DEFAULT WEB BROWSER was front page news. And people were upset.
And now....Microsoft has the stones to involuntarily change the operating system (and the license agreement) that it's users run on. What is the response? Sure there's outrage, but what are the real consequences to Microsoft? Maybe a class-action lawsuit at best for a few people? An apology for 'not being clear enough' about the upgrade process?
If you really want to be serious about how much control people have over your systems, you need to be a little bit more vocal, and a little bit more upset than this. The fact that the 'Internet Outrage' only caused the ad agency to double-down should probably clue you in to the level of action you really need to take here.
If you're not willing to defend against a company that is literally threatening your job security (I have clients with Windows 10 PCs), what threat are you to a fast food chain?