The OS is NOT free. You're personal information, habits, activity, all of it are being SOLD to microsoft's partners and being mined by intelligence agencies. People who know nothing about it will say "well you can go into settings and shut it off", but you cant.
I assume you also have rooted or jailbroken your smartphone (if one), installed an open source ROM and do not use any kind of Google services (in case of Android). It isn't any better on Apple either. You also definitely aren't using any social media services.
Some reports have been done where all of that is turned off and even third party tools used to shut down the insulting amount of spyware and the OS still makes 5000 connections out per day with your personal info.
I'm pretty sure that you pulled this right out of your ass, or maybe you're referring to the amateur test where the guy couldn't separate real internet traffic from modem access (192.168.0.1 etc.) and time synchronizing.
leaked NSA/CIA docs have confirmed MS is a preferred intelligence partner and makes it super easy to break in(for malicious parties too).
Yup. It's not like Android, iOS and OS X (and even Linux distros) weren't part of the leak too. You are just separating MS from there and don't even mention the others.
What did it really add?
Well, at least I can produce music with 20ms latency on Windows 10 (with DX mode), when 7 and 8.1 sturggled at 100ms.
Linux has come a far way. Vulkan is still really fresh but game Dev's HATE DX12 and are developing engines in Vulkan because its better and is cross platform. Linux is far from perfect and can be difficult to get all your apps going, but once you do, you'll never miss Windows.
Yeah, it's definitely like all AAA games, Ableton Live, FL Studio, Adobe products or real quality software work on Linux /s Linux on mobile is great just because it had Google behind it, which made things work.
Also, I'm not justifying these ads now but you have to remember that even though you buy Windows 10, you won't be buying it again, meaning that there will be no new major versions where MS could get their money from. Apple gets money out of their hardware, Google does exactly the same as MS do now. Maybe MS could go back to the earlier method and make every feature update cost around 20-50 euros or dollars, but that's just how it's now.