The EFF have a [rundown](https://www.eff.org/deeplinks/2016/08/windows-10-microsoft-blatantly-disregards-user-choice-and-privacy-deep-dive) of some of the ways in which Microsoft have tried to force users to upgrade to Windows 10 and how it spies on them.
I can understand that MS want users to upgrade as they don't want to be supporting old versions forever. They have been trying to get people off XP for years. There will be security issues with older software and this is a serious risk these days when just about everyone is on-line. Of course, new software has bugs too.
A large proportion of Windows users are non-technical. They will have just bought a PC that came with it installed and have no idea how upgrades and security updates work, so MS will try to make it simple for them. Many users will just accept the default options without reading into what they are accepting. They may end up upgrading without intending to and the way MS have forced this is definitely bad, e.g. when the user closed the upgrade screen this was taken as consent to go ahead.
The other aspect is how it spies on what you do. In order for the Cortana assistant to be helpful it needs to know about what you like, so they have to store information about you. They are not the only ones. Google knows a lot about me, but I accept that in exchange for useful services. Not everyone will realise what data they are sharing.
I'm okay with information being collected, but users need to be aware of it and the fact is that they will not read the T&C documents before ticking the box. To quote the Dead Kennedys, [Give me convenience or give me death](https://en.wikipedia.org/wiki/Give_Me_Convenience_or_Give_Me_Death).
One of the reasons I prefer to use Linux is that it does not spy on you as much, although Ubuntu have been accused of this. Nothing is perfect, but, ideally, you should know where you stand.
Found this via security guru [Bruce Schneier](https://www.schneier.com/blog/archives/2016/08/privacy_implica.html).
hiveblocks