Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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selling , trading , assigning , licensing , or otherwise conveying virtual property for real money or for funds credited to a nintendo account , where `` virtual property '' refers to any features of games or other content that can be traded with other users for free or for in-game virtual currency ; 

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