In a landmark ruling that could reshape the digital landscape, Google was found to have violated U.S. antitrust laws by using its search business to maintain a monopoly, according to a decision by U.S. District Judge Amit Mehta on Monday. This significant defeat for the tech giant could have far-reaching implications for how Americans access information online and potentially disrupt Google's long-standing dominance.

"After having carefully considered and weighed the witness testimony and evidence, the court reaches the following conclusion: Google is a monopolist, and it has acted as one to maintain its monopoly," Judge Mehta wrote. "It has violated Section 2 of the Sherman Act."

The ruling came from the U.S. District Court for the District of Columbia, marking a decisive rebuke of Google's core business. Google has invested billions in exclusive contracts to ensure it remains the default search provider on smartphones and web browsers, effectively sidelining competitors like Microsoft's Bing and DuckDuckGo. This strategy, the court found, was central to Google's anticompetitive behavior.

The court highlighted Google's exclusive deals with Apple and other key players in the mobile ecosystem as particularly egregious, stating that these agreements were anticompetitive. Additionally, Google's monopoly power allowed it to charge high prices in search advertising, which has been a significant revenue source for the company.

"This victory against Google is a historic win for the American people," Attorney General Merrick Garland said in a statement. "No company - no matter how large or influential - is above the law."

Google, which did not immediately respond to a request for comment, is likely to face a separate proceeding to determine penalties. Potential remedies could include changes to how Google makes its search engine available, possibly affecting its ability to secure exclusive deals. Experts like Vanderbilt University law professor Rebecca Allensworth suggest that the court could also implement measures such as a "choice screen" to inform users about alternative search engines.

Despite the significant ruling, Google's broader search ad monopoly was not confirmed, reflecting the complexities of the case. This decision is distinct from another antitrust suit brought against Google by the Biden administration in 2023 concerning its advertising technology business, which is set for trial in early September.

This ruling represents the second major antitrust defeat for Google within a year. Previously, a federal jury in California found that Google ran an illegal monopoly through its app store. That case is still pending a decision on possible remedies.

"This is definitely a landmark," said Diana Moss, vice president and director of competition policy at the Progressive Policy Institute. She likened the ruling to historic antitrust cases, including the breakup of AT&T's telephone monopoly and Standard Oil, and Microsoft's illegal bundling of its Internet Explorer web browser with Windows.

However, not everyone is applauding the decision. Adam Kovacevich, founder of the tech advocacy group Chamber of Progress and a former Google policy director, argued that the biggest beneficiary of the ruling would be Microsoft, not consumers. "Microsoft has underinvested in search for decades, but today's ruling opens the door to a court mandate of default deals for Bing. That's a slap in the face to consumers who chose Google because they think it's the best," he said.

The ruling also raises broader implications for the tech industry. It could signal the start of a new era of antitrust enforcement that might challenge other major tech companies like Apple and Amazon, both of which are facing their own antitrust lawsuits. The decision could also bolster the Justice Department's antitrust lawsuit against Live Nation, the parent company of Ticketmaster.

Judge Mehta's 277-page opinion follows a detailed trial that included testimony from high-ranking executives from Google and its rivals. Much of the trial was conducted behind closed doors due to the sensitive nature of the business information discussed.

Critics argue that Google's monopoly on search allows it to maintain a significant advantage in artificial intelligence. By controlling a vast amount of search data, Google can train its AI models more effectively than its competitors, potentially cementing its dominance in the emerging AI landscape.

"If the court takes away Google's agreements that make it the default search engine on so many devices, it could hurt the company's core product at an extremely pivotal moment," said Evelyn Mitchell-Wolf, senior analyst at Emarketer. She highlighted the growing threat posed by AI-powered search tools like OpenAI's ChatGPT.