I disagree with the sentiment that the solution to wanting Atom on Windows is to switch to Mac.
For starters, it’s not a full-blown language-or-platform-specific IDE, it’s a programmer’s text editor. Its demographic isn’t restricted to OS X, and (at least most of) the technology it’s built on isn’t OS X specific, so the product shouldn’t be either. Even full IDEs make a point of being cross-platform, unless they’re specifically for developing for a particular OS (Eclipse/Idea vs Visual Studio/XCode)
Furthermore, and I think this is the more important point, many (if not most) developers work in an environment where they don’t get to pick the OS of their workstation. If IT at FooCorp only knows how to manage Windows machines, than the workstation at your desk that has the certificates to connect to your internal network is, in fact, a Windows machine.