[pasc1878]

Pedantically this is correct still.

You are not using UNIX unless you paid for a mac or iPhone (or higher cost machines like IBM AIX et.)

Linux is not a UNIX - it is not certified. Noone has paid for it to be certified.

[mumblemumble]

That's kind of exactly what I'm getting at. Officially licensed Unix is all but dead. It was outcompeted by freer (choose your own capitalization, either works) POSIX operating systems.