MELBOURNE, Australia — Epic Games, the company behind the popular online game Fortnite, on Tuesday won a partial victory in an Australian court. The case was brought by U.S. billionaire chief executive Tim Sweeney, who claimed that Google and Apple engaged in anti-competitive conduct in running their app stores.

Federal Court Justice Jonathan Beach upheld key parts of Epic’s claim that the tech giants breached Australian competition laws by misusing their market power against app developers and using restrictive trade practices.

Google and Apple ’s dominance of the app market had the effect of substantially lessening competition and breached Australian law, Beach found.

But the judge rejected some of Epic’s claim including that Google and Apple engaged in unconscionable conduct as defin

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