In practice, Microsoft doesn't really care because they just tie the Windows license to your physical motherboard (that's why you can reinstall Windows on your laptops over-and-over again without a license prompt). This only matters in hobby builder circles where you build your own computer

So yeah, its not really a thing NFTs solve, and something that a very simple chip on a motherboard solves perfectly.

People don't really "buy Windows" in practice. They buy a laptop, or a Dell computer. And they sell the laptop, or Dell computer, in its entirety.