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