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