Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
fitbit 's failure to enforce any right or provision of these terms will not be considered a waiver of such right or provision . 

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