If congressional hearings can be entertainment, last week’s star-studded testimonies from top tech execs could be this year’s summer blockbuster. For the first time, the CEOs of Amazon, Apple, Google, and Facebook were grilled on antitrust concerns before members of the House Judiciary Committee.

Much of it was show, as various proceedings against U.S. tech titans are working their way through the Department of Justice and Federal Trade Commission. Still, the House Antitrust Subcommittee hearing at least illustrated the core concepts of competition policy under scrutiny.