Enlighten me: Someone clicked in typical "just ok everything"-mode on "update to Windows 10" and ... surprise ... it updated to Windows 10. Dark pattern? I don't see it.
People like latest and greatest things, so they see a pop-up "Hey, Windows 10 is here! Click here to upgrade!". And the person is like "SWEET! GIVE IT TO ME!". After 1 hour of upgrading, user is back in Windows 10, "Damnit, some of my shit ain't working! Goddamn automatic upgrade!"