Google’ stinging defeat against Fortnite-maker Epic Games in a California courtroom could be an important blow against big tech’s decades of supremacy on antitrust matters in the United States. With Washington lawmaking gridlocked and pro-business judges dominant in federal courts, US tech giants have survived unscathed for years against accusations of wielding illegal monopoly power. While Europe, Britain, India and others enforce regulations that at least try to keep big tech in check, Google, Apple, Meta and Amazon have yet to suffer a significant setback on their home turf. But a jury of nine on Monday possibly changed that equation,…