Indeed, I'd wager good money they set that to show GPL because of the "Module <mod> taints kernel" message that appears in peoples logs. That and hey, this is how F/OSS works isn't it? You say it's GPL'd and then tell people bite me when they want to see the source.
Erm... no S3. It's not. You set the GPL flag only and I do mean ONLY if you are going to comply with the GPL. Otherwise you a) look like idiots b) annoy people c) get laughed at d) make people highly suspicious of your intentions e) all of the above.
And I'm getting sick of stuff like this happening. Support Linux or don't. GPL or don't. Just make your bloody mind up which it is and get on with it. It stopped being entertaining a long time ago; go learn some new dance steps.