Fortnite isn't on Microsoft's Xbox Cloud Gaming service because

Epic Games isn’t putting Fortnite on Microsoft’s Xbox Cloud Gaming service because it views the platform as a competitor. An Epic Games executive has revealed why Fortnite isn’t on xCloud.

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Playing Fortnite on (Xbox Cloud Gaming) I don't play fortnite but I wanted to see how it plays/runs : r/xcloud

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Fortnite isn't on Microsoft's Xbox Cloud Gaming service because Epic won't allow it : r/xcloud