Why not? Do you pay them for their time? I don't. So who am I, what do they owe me? Nothing. Not even a new free version of linux.
>Read my previous comment: The beauty of proprietary software is that you can exactly do that - take the last public version, patch it and make something better, something that's more the way you like it, no matter what the original owner thinks, says or does. :)
No, actually you can't. You're not entitled to unless you specifically sought a license that permits it. All Open Source Licenses grant you that permission.