Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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this includes win trading and any other kind of manipulation of rankings , taking advantage of errors in the service to gain an unfair edge over other players and any other act that intentionally abuses or goes against the design of the service . 

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. OPTIONS: ["Limitation of liability", "Choice of law", "Unilateral termination", "Arbitration", "Unilateral change", "None", "Jurisdiction", "Contract by using", "Content removal"].