There's no GPL in the BSD sources used by Apple or Sony. They are free to release their operating systems as closed source; Sony does this. Apple releases Darwin sources "out of the goodness of their hearts", meaning, back in the 2000s they wanted to capture mindshare amongst the tech community for whom Linux was the strongest contender. Now that the future has refused to change, the year of the Linux desktop never materialized, and macOS has become the default developer's workstation OS, Apple has been much more sparing with Darwin source drops and may cease them altogether.
GPL where applicable. If it's MIT or just "as is" then no, they won't but they definitely publish the sources to what they are required to. Since FreeBSD is "as is" 4.4BSD licensed, they aren't required to publish the sources of Orbis.
Due to GPL, they release the sources to the BSD code they use. Everything else is proprietary.
Likewise Sony used BSD for PlayStation OS. They publish the sources to the changes to BSD they made, the rest is proprietary.