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SpaceX Begging Feds To Ground Apple-Funded Rival's Satellites
(www.jalopnik.com)
This is a most excellent place for technology news and articles.
OSX was never really open sourced. If you tried compiling it, you'd have found it wouldn't work because it was incomplete.
Darwin was just their version of BSD which they released in order to comply with the license, but the actual Desktop/UI was a separate stack. You could build and install Darwin, but it wouldn’t do anything.