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.
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Yeah, reading these comments, it looks like they are not legally able to call it unix, despite having direct lineage. Linux however is a complete re-write, making it more obviously not proper unix by most definitions.
That’s because UNIX is a trademark and OS vendors will have to pay fees to opengroup.org in order to call their OS Unix.