This may be one of the few discussions where the licensing discussion is apropos, so consider my prior rant as something broader.
But it doesn't help when "great harm" hyperbole gets thrown around. The world has benefited from the gift, unless anyone is daft enough to argue that Illumos' existence, FreeBSD's incorporation of ZFS and DTrace, and OSX's incorporation of DTrace, are a bad thing. Hell, DTrace is even being used for PS3 game production.
But it doesn't help when "great harm" hyperbole gets thrown around. The world has benefited from the gift, unless anyone is daft enough to argue that Illumos' existence, FreeBSD's incorporation of ZFS and DTrace, and OSX's incorporation of DTrace, are a bad thing. Hell, DTrace is even being used for PS3 game production.