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I don't think Android is an officially licensed version of UNIX though? (I wouldn't normally nitpick, but I assumed that's what was meant by "commercial UNIX".)

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Neither is Solaris at this point. Oracle no longer renew their Unix certification for Solaris. Apple still has macOS certified though.

https://www.opengroup.org/openbrand/register/

Ten years ago, Solaris was still a certified "UNIX" system.

I don't get it. Isn't Darwin open source ?

macOS as of Leopard is “certified UNIX” (Single Unix Specv3). Darwin is the “Unix core” that macOS is built on, but it hasn’t been certified by itself[0].

[0] https://en.wikipedia.org/wiki/Darwin_(operating_system)

Darwin is just a bunch of source code dumps at this point. Gone are the days when Apple provided an actual bootable ISO.

Did they ever?

yes, approximately until 10.4 Tiger: https://web.archive.org/web/20100303160410/http://www.openso...

(importantly those links still work, even outside of the Wayback machine)

Thanks for that!

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