Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
once this procedure has been followed tripadvisor will make all reasonable endeavours to remove illegal content within a reasonable time . 

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