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