And even more important - CUPS.

Yes, but they didn't create CUPS. Keeping it open source might have been a conditions of the purchase (citation needed :)

Perhaps you're right, I don't know, but for me it's irrelevant. Someone wanted examples of OSS from Apple, and in my opinion it's the most important one when I was a Linux User. I was not trying to defend Apple. I think they deserve a lot of criticism they receive, but that they also deserve some credit. This is also true for most (if not all) other firms that are often discussed here. Just wanted to highlight that rarely are things black or white, but that we rather deal with a lot of different shades of grey.