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