Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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we will notify you before we make material changes to these terms and give you an opportunity to review the revised terms before continuing to use the fitbit service . 

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