It's not exactly insightful but it does have some merit. Apple's approach is an odd mix of open and closed. You could describe it as 'strategically open'... (of course - this applies to Google too to a slightly lesser degree).
No company supports open-source if it directly conflicts with their perceived interests. Some companies just take a wider view than others.
I'd like to see a compiled list of open technologies Apple has chosen vs closed. "invariably closed" my arse.