Windows NT already had POSIX support.

They also realized that the crowd that buys Macs to do UNIX development doesn't care about Linux, they only want a POSIX like environment.

And since GNU/Linux has eroded the other UNIXes, the Linux kernel ABI has become more relevant than POSIX, that is all.

It just shows that servers run Linux. Because there is the majority of the development happening.

Which is just the point I'm making: develop for Linux and don't worry about development for the Windows platform in 2021 (for most scenarios).

And if you're using WSL you are using Linux effectively. Windows is just that UI around you. Microsoft makes some good products/services and I think they have shifted in strategy. They are not so interested in what _specific_ APIs/OS you use (Win32 or Linux ...) as long as you do it "inside" Windows on the Desktop or on Azure in the Cloud. It clear that the Linux platform is dominating because Linux is everywhere from servers to mobiles.

One of the parent comments was complaining about lack of good _native_ windows support in Crystal. I've responded to why it may not be critical to have good _native_ windows support anymore above in detail...

People are really thinking too much into the possibilities.

Many people also don't use WSL. Many don't even have the basic nix tools on their path.

You may say that they aren't your target audience, but many new technologies weren't popular until they made them their target audience.