The European Union's highest court has slammed the door shut on Google's eight-year fight against a record €4.1 billion ($4.7 billion) antitrust fine, ruling that the tech giant used its Android mobile operating system to illegally cement its search monopoly.

The Luxembourg-based Court of Justice of the European Union dismissed Google's appeal on Thursday, July 2, upholding the penalty originally imposed by the European Commission in 2018.

"The appeal brought by Google and its parent company Alphabet against the judgment of the General Court is dismissed, thereby confirming the penalty imposed for Google Search's abuse of a dominant position in the context of the Android operating system," the judges ruled.

At the heart of the case were agreements forcing phone manufacturers to pre-install Google Search, the Chrome browser, and the Google Play app store on their Android devices. The Commission found these practices prevented manufacturers from using rival operating systems or offering devices with alternative search engines.

The original fine of €4.34 billion was trimmed to €4.1 billion by a lower tribunal in 2022, but Google continued its legal fight to the highest level. Now, the fight is over — and Google has lost.

A Google spokesperson said the judgment "failed to take into account" the company's investment to keep Android open, interoperable and free. "In any event, we adapted our agreements to comply with the initial decision back in 2018, and we remain focused on continued innovation and openness."

The ruling has implications far beyond the fine itself. Google has accumulated close to €11 billion in EU antitrust fines over the past decade across three separate cases. The loss of an earlier shopping comparison case led to a wave of lawsuits seeking billions in damages across half a dozen countries.

Just a day before the Android ruling, a Swedish court ordered Google to pay approximately $1.5 billion in damages to PriceRunner, the price comparison site now owned by Klarna. This Android ruling is expected to trigger a similar cascade of private damages claims.

For Google, more EU challenges loom. The company faces fresh scrutiny under the Digital Markets Act for allegedly favoring its own services in search results and for practices related to its app store.

While the record fine represents less than 3% of Alphabet's annual profit, the real cost may be in the precedent it sets: the EU's top court has sent an unmistakable signal that Big Tech's dominance will face rigorous enforcement, and that rivals and regulators alike now have a powerful legal foundation to pursue their own claims.