Found this photo from TechDigest via reddit, and it puts a nice, clear visual explanation out there for why Linux is not included in this new ‘PC versus Mac’ ads that Apple is running:

For the record, the dude on the right is computer consultant, Linux enthusiast and COSPlayer Jay Maynard, AKA TronGuy. And yes, that suit does in fact light up. Ladies and gentlemen, the face of Linux.