CUPS is owned by Apple. Mach, OpenSSH, OpenSSL & Apache are not copyleft. The success of Apple has nothing to do with the copyleft software they use, most code used by Apple has been based on permissively licensed code or written by them. The main software asset Apple has is Cocoa and Cocoa Touch, which are as far from copyleft as you can get. Apple could replace every piece of copyleft software they have left in OS X tomorrow and no mainstream news source would bother to inform of this. That's how relevant copyleft software is to the success of Apple.

Now if you say "open source has been an integral part on the success of Apple", I would agree with that. Still Apple owes its success to it's own code not to code from others. If taking open source code and modifying it a little was all it took to make a successful company, all of us would be millionaires.