They're flouting the GPL in the sense that they produced a binary-only driver enabled by a compatibility layer released under GPL that, in my uninformed opinion, probably violates the GPL. It still doesn't do me any good, though; I'm on my second laptop with Optimus graphics, and they're just not going to make their hardware work on this machine when it's not running Windows. Fortunately, I only need 3D acceleration when I'm gaming, and the machine came with a Windows license, so dual-booting is an option for me.