The Maker of the popular video game Fortnite has won a US court battle against Google, with a jury deciding that the search giant had operated an illegal monopoly. Epic Games sued Google in 2020, accusing it of unlawfully making its app store dominant over rivals. Hundreds of millions of people use the store to install apps for smartphones powered by Google’s Android software.

The Epic Games, Google said it would challenge the outcome. However Epic chief executive Tim Sweeney welcomed the verdict. He said the court would start considering the issue of compensation in January. The Lawyers for the two companies made their final arguments on Monday in a trial that lasted more than a month. Despite the legal defeat, Google is continuing to defend its business model.

The case also challenged transaction fees of up to 30% that Google imposes on Android app developers, and how the tech giant ties together its Play Store and billing service, which means developers must use both to have their apps in the store. The Epic Games Google maintains that its commissions are competitive for the industry and that it provides bonuses like reach, transaction security, and protection against malware.

But if the ruling stands, Google may have to allow more app stores to store Android-powered devices and will lose revenue it makes from any in-app purchases. Epic Games has its app store on PC, which offers its products as well as third-party apps and games.