Windows 10 will get a majority of the Windows market. In fact, in some areas -- the USA and the UK, for example -- Windows 10 overtook Windows 7 late last year, on StatCounter's numbers.
And since they gave away a free upgrade for the life of the device, at a considerable cost in terms of servers and bandwidth, it wasn't profiteering either.
Pro tip: when a for-profit company does something that appears to be uncharacteristically altruistic...
...Aw, heck, you know what? Never mind. Enjoy the garden.
As for your "garden", anybody can build their own Windows PC and sell it, without restriction. Anybody can write Windows software, and sell it. Anybody can use a Windows PC and software for any purpose they choose.
If you want to attack people for restrictions, you can find far more of them in other parts of the tech world.
If you have hardware that only runs in XP you don't care.
I have more than a few Windows 7 installations that are nothing but hosts for virtual machines that run XP.
But in reality, we're rapidly approaching the point where we absolutely need to be able to sandbox apps and segregate them from the platform like with UWP.
While the basic functionality of the OS you need may not change much, the constantly moving target of security definitely will, and both 8 and 10 introduced significant improvements in security.