The article discusses how the US antitrust laws that were originally intended to curb the monopolistic practices of companies like Standard Oil and AT&T are now being used to scrutinize the business practices of tech giants like Google and Apple. It highlights how these companies have grown to become dominant players in their respective markets, raising concerns about potential anti-competitive behavior. The article mentions that the US Department of Justice and Federal Trade Commission are investigating Google and Apple, respectively, for alleged antitrust violations. It also explores the challenges faced by regulators in applying century-old antitrust laws to the modern digital economy, where network effects and data accumulation play a significant role in market dominance. The article concludes by suggesting that the outcome of these investigations could reshape the tech industry and potentially lead to new regulations or even the breakup of these tech giants.