Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we reserve all rights not expressly set forth in these terms . 

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