That's the point though.
What's left of Sun is basically a startup founded by a few ex-employees, some open-source software, and the rest of their IP being milked by Larry Ellison.
Neither SunOS or Solaris were open source, or based on open source.
I'm not talking about SunOS or Solaris. I'm talking about Java, dtrace, OpenZFS, and a various other random bits of Sun legacy still floating around in modern open-source systems.