Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
airbnb is not and does not become a party to or other participant in any contractual relationship between members , nor is airbnb a real estate broker or insurer . 

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