I’m not so sure about that. Windows despite its ads is still generally usable or at least readable, but adblockers affect almost every website, and in a much more extreme way, without which renders some websites virtually unusable. As someone else said, installing another browser is also far easier than taking backups, installing an entirely new OS, implementing your backups, and learning an entire new OS which may not readily support the software you have licensed from windows for most users.

Users care a lot about convenience. I expect that they weigh installing and learning linux etc as less convenient than the ads in windows which is why they would not switch, but I expect when it comes to this case, they would weigh installing a different browser with adblock as much more convenient than using the internet with ads on every single website.