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