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