And? The source is there. There is no requirement to do extra work to make it useful for anyone but yourself. They did not even need to release the source, but

And? The source is there. There is no requirement to do extra work to make it useful for anyone but yourself. They did not even need to release the source, but they did. You made a claim about "proprietary forks of all the BSD stuff". The kernel is open source. The rest of the OS is written from scratch by Apple, and originally by NeXT, and is not a fork of anything. Are you standing by your original claim?