One reason that I did not use Win10 so far(Windows 7 for Tax and the rest is Linux), to be fair, Microsoft is not alone doing this in the big-data-mining era.
I wouldn't use Windows (especially 8+) for anything other than superficial activities like gaming. It's a shame as Windows is more polished, but I miss the days when an OS was an inert thing you didn't have to think about (damn you Internet!).
