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I think that the win rate cannot be direct proof of unfair play. For many, this percentage does not reflect their actual skill. For example, Alex_R, who once tried to convince me that counting damage in battles is completely unnecessary (and couldn't say how much damage 200 troglodytes inflict), has an incredibly high win rate. And conversely, there are people whose gaming skill is higher than their win rate.
Even if there are replays of someone's questionable gameplay, what additional information will they provide? There is a program that allows you to restore the movements of heroes. This is quite enough.