Why can't I just buy it without being charged for preinstalled spyware?
Image description:
Shopping for a laptop as a Linux user:
Screenshot from the Simpsons where Otto is talking to Marge and Homer standing next to a window in their house with a caption "Oh wow, windows!... I don't think I can afford this place."
Not to be that "aktchually" guy, but Microsoft actually ends up paying OEM's to ship with Windows, in order to drive costs down to be more affordable than competitors. You can still reimage with Linux, which I know, is an extra step from it shipping with Linux, but in a wild turn of events, we can thank Microsoft for driving down the prices of our to-be-Linux machines ;)
I think that was only true back in the 90s, when there were still other OSes to compete against Windows, like OS/2, Solaris and BeOS late in the decade. Once Microsoft effectively dominated the consumer PC market (2000s?), they turned around to threaten to never do business with OEMs that dared to bundle competitors' OS. They also did something similar in Japan, which destroyed NEC (who created the PC-88 and PC-98, the most popular 80s and early 90s computers there) dominance.
This route does still count as a Windows sale and you still pay for the license.
So if the manufacturer offers a "no os" option, rather than any Linux option, it's still a better choice than "Windows" if you know you will reimage to something else anyway.