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: Mignon McLaughlin was an American journalist and author. In the 1950s, she began publishing aphorisms that were later collected in three books, entitled, The Neurotic’s Notebook, The Second Neurotic’s Notebook and The Complete Neurotic’s Notebook.