Alt text: meme with the 'Always has been' format Linux, MacOS, OpenBSD and ChromeOS logos on top of the Earth The first astronaut says 'Wait, it's all Unix?' A Windows logo, on top of the second astronaut. The second astronaut says 'Always has been' and points a gun to the first astronaut.
Half of those are Unix-like. Don't forget what GNU stands for (literally, not philosophically)!
To be fair, iirc, macOS is certified UNIX despite having the XNU kernel which stands for X is Not UNIX.
Certified? Are you saying it’s POSIX?
There was another OS that was POSIX compliant too...