Comment Re:Proprietary forks not bad for end users ... (Score 1) 710
Apple do publish the modified kernel source code, though. And they have contributed a few interesting things as open source, such as launchd and the upcoming Darwin Calendar Server.
They have also, of course, released their modified version of KDE's KHTML as open source (WebKit), as well as their changes to GCC and other GPL licensed projects.
So they do release source even when they're not forced by the license. Presumably to gain goodwill. Just freeloading would probably hurt their chances of appealing to the Linux/BSD using market.