Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
15.1 this agreement shall be effective for a 30-day term , at the end of which it will automatically and continuously renew for subsequent 30-day terms until such time when you or airbnb terminate the agreement in accordance with this provision . 

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