Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
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 . 

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