Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
links to such third-party services are not an endorsement by airbnb of such third-party services . 

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