The CEOs of Apple, Google, Facebook, and Amazon testified in Congress, trying to convince the House Judiciary Committee that their business practices don’t amount to anti-competitive monopolies. It’s one of the biggest tech oversight moments in recent years, part of a long-running antitrust investigation that has mustered hundreds of hours of interviews and over a million documents from the companies in question. Amazon’s Jeff Bezos, Facebook’s Mark Zuckerberg, Apple’s Tim Cook, and Google / Alphabet’s Sundar Pichai all laid out their defense strategies in published testimony. They made the case that their companies are providing beneficial products in a landscape filled with competition and that their massive scale simply makes their services better. Many members of Congress questioned those claims.