Why do you still use Windows 7?

I’m just curious as to why people are such big fans of Windows 7 and refuse to upgrade to Windows 10. I see a lot of people claim that they’ll never upgrade but no-one gives a reason.
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Did you try https://en.wikipedia.org/wiki/Criticism_of_Windows_10 ?

Windows 10 is the switch to total remote control of your machine by Microsoft.