I don't have a link, but there was a note on the Webstorm blog or whatever about how they were not adding Flow support because the majority of their users were

I don't have a link, but there was a note on the Webstorm blog or whatever about how they were not adding Flow support because the majority of their users were on Windows. Obviously, considering the kind of tooling Webstorm provides, it would have a huge selection bias...but Jetbrains seems to be making money with a product for JavaScript that mostly caters to Windows users. So there's "enough" Windows users doing JS on Windows. Heck. Support/doc/headway aside, I strongly feel it was one of the big factors that pushed TypeScript beyond the critical mass. You just can't make a JS dev tool *nix only and expect critical adoption. Atom editor had the same issue.