Linux is not in the public domain. Linux is a cancer that attaches itself in an intellectual property sense to everything it touches. That's the way that the license works.
Bio: Caitlin Flanagan is an American writer and social critic. A former staff writer at The New Yorker, she is a contributor to The Atlantic. Her book To Hell with All That: Loving and Loathing Our Inner Housewife was published by Little, Brown in 2006.