Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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the failure of crowdtangle to exercise or enforce any right or provision of the terms of service shall not constitute a waiver of such right or provision . 

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