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