Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
15.2 you may terminate this agreement at any time via the `` cancel account '' feature on the airbnb platform or by sending us an email . 

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