A judge has ruled that Google’s search engine has been illegally exploiting its dominance to quash competition and stifle innovation in a decision that could shake up the internet and hobble one of the world’s best-known companies. The decision issued by US District Judge Amit Mehta comes nearly a year after the start of a trial pitting the Justice Department against Google in the country’s biggest antitrust showdown in a quarter of a century. After reviewing reams of evidence that included testimony from senior executives at Google, Microsoft and Apple during last year’s 10-week trial, Judge Mehta issued his decision three months after the two sides presented their closing arguments in early May.

Google’s search engine processes an estimated 8.5 billion queries per day worldwide, nearly doubling its daily volume from 12 years ago, according to a recent study from the investment firm BOND. Google will almost certainly appeal against the decision in a process that may land in the Supreme Court.

For now, the decision vindicates antitrust regulators at the Justice Department, which filed its lawsuit nearly four years ago while Donald Trump was still president, and has been escalating it efforts to rein in Big Tech’s power during President Joe Biden’s administration. The case depicted Google as a technological bully that has methodically thwarted competition to protect a search engine that has become the centrepiece of a digital advertising machine that generated ne.