> "I'm a bit unclear what you seem to think is lost under these circumstances versus copylefted software. Let's say Apple released Swift under the GPL. They would still be free to do all of the things you describe."
Absolutely not. GPL means anything you put out must be published. If LLVM and Swift are GPL'd they can't develop additions to them, ship them on their Macbooks, and not publish the changes to the rest of the internet.
> "I'm a bit unclear what you seem to think is lost under these circumstances versus copylefted software. Let's say Apple released Swift under the GPL. They would still be free to do all of the things you describe."
Absolutely not. GPL means anything you put out must be published. If LLVM and Swift are GPL'd they can't develop additions to them, ship them on their Macbooks, and not publish the changes to the rest of the internet.
This is what's happening right now with LLVM.