Messing with the UA header is going to get you flagged by every bot detection tool because when you change your header from "Firefox on Linux" to "Chrome on Windows" your fingerprints don't add up anymore and you look exactly like a poorly written bot. You're likely going to see more captchas, you might get blocked or rate limited more often, and get placed under increased scrutiny, orders held for verification, silently filtered or shadow banned, etc.
It any case, it would be silly to assume services measuring OS popularity would put up such limitations. And more likely than not, people are changing their UA as a work-around on a case-by-case basis than make it a default, since that's gonna cause trouble.
In the last decade, the only time, I actually had to touch the UA is when breaking ToS with curl :D
But well, I haven't had to spoof my browser's UA for a few years. If some site refuses it, I'll just move on. (Including some that started doing it after I brought thousands of dollars worth of stuff from them.)
> "Changing the user agent without changing to a corresponding platform will make your browser nearly unique."
Sorry, I am not sure, if arguing about nuanced reality is the battleground, where I see you thriving.
[1] https://coveryourtracks.eff.org/ (browser test since 2014)
