I'm not sure how accurate StatCounter is, given that most Linux users use adblockers. However, according to it, Linux has almost a 14% desktop share in India.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
But you're not infringing on any copyright. You're downloading a copy of Windows directly from Microsoft legally, and then activating it using a free and open-source script hosted on Microsoft's own servers. You aren't breaking any copyright law in doing that.
That's how it should work, but creating a derivative of a copyrighted work, through modification, even if it is for personal use, is technically illegal in the US.
Copyright doesn’t even apply until you attempt to distribute the covered work, so no, this is false.