> Isn't Apple clang open source anyway? So what is really the point?
The best explanation I have seen is the speculation that apples software patents are seen as a critical part of apples business model and competitive strategy, especially 10 years ago when their anti-gpl stance was formed. GPLv3 patent clause adds risk, especially the patent agreement clause, and if you intend to spend millions over software patent lawsuits then staying away from GPLv3 looks much more reasonable, especially if you ask the patent lawyers.
The best explanation I have seen is the speculation that apples software patents are seen as a critical part of apples business model and competitive strategy, especially 10 years ago when their anti-gpl stance was formed. GPLv3 patent clause adds risk, especially the patent agreement clause, and if you intend to spend millions over software patent lawsuits then staying away from GPLv3 looks much more reasonable, especially if you ask the patent lawyers.