Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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additional terms and conditions may apply to surveys , contests , giveaways , and other promotions sponsored by fitbit or its partners . 

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