Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
use the airbnb platform in connection with the distribution of unsolicited commercial messages ( `` spam '' ) ; 

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