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The competition rules do not mention any obligation to keep games online indefinitely, any perpetual right for the organizers to host them, or that removing a game from a third-party platform would be a violation."
They don't have to - that's common sense. In Poland we even have a saying for that: "kto daje i odbiera, ten się w piekle poniewiera" = "one who gives and then takes back is surely rotting in hell"...