Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
7.1.7 airbnb recommends that hosts obtain appropriate insurance for their host services . 

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