Ya think? Even though they said updates would be free as long as you installed them all in a timely fashion? Yep, they might. Promises, like rules, were made to be broken, right?
Ya think there's a hidden magic switch inside Windows that can turn off the OS remotely if the rent doesn't get paid? Guess what, they already have that switch. It's called Windows Activation Technology, and was called Windows Genuine Advantage. They can turn off your copy of Windows at any time, for any reason.
Just sayin'...
I can think of only one reason to move my Windows 7 computers to Windows 10. That Windows 7 updates will cease in 4-5 years.