Well, it's a word that begins with "L," that's true...
I just found out recently that according to the EULA for any windows OS Microsoft still owns the software. By using it and agreeing to the EULA you are only leasing the software and that Microsoft has the right to change or view anything on your computer.
Actually, you are *licensing* the software. You do not purchase it -- therefore, you do not *own* it. But you possess a license to use it per the terms -- and gosh knows, they make gripping reading -- of the license agreement. The distinction comes down to issues with copyright law, and licensing is not at all unusual when it comes to digital products -- software, music, your phone, etc. (I work for a software company and we license our software as well.) Much of what goes onto silicon is licensed, not owned. Here's an older but quickly effective article on that topic:
https://www.theguardian.com/commentisfree/2013/apr/05/digital-media-licensed-not-owned
As far as rights to change or view anything on your computer, no, Microsoft has a privacy agreement that stipulates various conditions, among them consequences of using certain features that depend upon transmitting information, etc.
I do believe the license agreement does require you to accept periodic updates, but I believe it also provides for a way to select which updates you wish to reject -- the consequences of which may be a loss of functionality, etc.
(And for what it's worth on the original topic, I split my time between Windows and Mac OS, and am actually very happy with Windows 10. There are aspects to both operating systems that are praiseworthy, and headscratchers on both as well. The stability of Windows 10 has been noted by others, and while previous versions set a low bar to hurdle, I have no complaints. The ironic development on the Windows front is that by taking pages from Apple's book in terms of building their own systems, they've both made some great products -- I *love* my Surface Pro -- and caused the wider market to up their game, too. Who knew that Microsoft would turn out to be an even better hardware manufacturer than a software developer?)