I forgot it and completely agree, they want a cut of anything installed on the machine. And following this logic I wouldn't be surprised if they would make it increasingly difficult to install any non store app. Requiring them to be signed first, then signed by them against a fee, then simply not allowed like iOS does.
Which is why not having the option to turn down upgrade after having been upgraded to windows 10 is problematic.
They did do something similar with Windows RT, but that was completely locked down with no existing Win32 app base to worry about. And yes, they do have uninstall I think with 30 days before files are deleted.
They are already doing it with drivers. Windows 10 will only load Microsoft signed drivers and Windows Server 2016 will only load WHQL signed drivers for which you have to pay a fee.
It's mostly about Windows Phone, which needs apps, which means the store needs users. If it gets users then people will bother to develop cross phone/desktop apps. Of course no one uses the store still, even as Microsoft tries to force/trick you into logging in with a Microsoft ID.
They're rushing to copy all the things I dislike about Apple. They're also rushing to emulate the things I hate about Google and Facebook. Meanwhile they are doing little to fix what I don't like about Microsoft, nor are they copying many of the good things.
In Zero to One there is an excellent chapter about the dark side of competition and how it makes you cargo cult your competitors instead of thinking creatively. This is an example.
Don't compete. Innovate and focus on the user and the problem domain, not the others. Otherwise you just become an inferior copy.
Windows 10 Spyware Edition is a misstep like Google Plus.
Which is why not having the option to turn down upgrade after having been upgraded to windows 10 is problematic.