Are you guys who are writing about auto-upgrades now in the US or somewhere else? (That's a serious question. Wherever you are, you are lucky it's taken this long for this scourge to reach you.)
I live in Singapore. From about September or October 2015 I got these 'do you want to upgrade' messages. I said 'no' every time. I don't like the way Windows 10 infringes privacy and didn't have the time to find and changes all necessary settings to stop them doing so. Plus my help desk guy advised me to wait until more bugs were ironed out.
I went down to Australia in mid-December. I still kept on answering 'no'. But I didn't turn off the auto-updates. Silly of me, but lulled into a false sense of security by continually being asked. I didn't turn my computer off one night and the next morning, guess what? I'd been automatically upgraded. I then spent two or three hours deleting all the rubbish that comes bundled with Windows 10 (and that I'd already deleted from Windows 8), reloading my printer, scanner, etc. drivers, finding and re-setting my preferred defaults, finding file folders and such things that Windows 10 had decided I'd like to file in a different place. Oh, and deciding that I'd bite the bullet and move to an Apple Mac. I don't suppose Microsoft cares that they lost a customer.
The same thing happened to a friend of mine in Singapore, but a bunch of his files and emails were either deleted by the upgrade or buried so deeply in some strange place that he's not been able to find them. And he's no amateur computer user.