Illustration: Sarah Grillo/AxiosGoogle's dominance of the online advertising and ad-tech markets violates U.S. antitrust laws, a federal court ruled Thursday, in a decision that could scramble the massive digital ad universe.Why it matters: It's the second major recent antitrust loss for Google, after a different court ruled last year that the giant has abused its dominance of the search market online.How it works: The federal government and 17 states who brought the suit seek to force Google to...