PC Master Race

First off, as others have said, Wine and ReactOS benefit each others' development.

But second, for those folks, particularly less-tech-savvy ones, who feel like they "have to" use Windows for one reason or another, "Windows except FOSS" seems a much easier and more tempting option than "Linux but tries to be like Windows". I do think that argument is a bit less compelling than it once was, but for sure, if ReactOS was "done" and fully compatible with Windows 11 or whatever, my mother, for instance, would be beyond thrilled to switch to that. As it is, she's kinda sorta starting to come around to the idea of using Linux maybe at some point, but she fears the learning curve. (And I very much don't blame her for that.)