Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
modify or cause to be modified any files that are a part of the service or any supercell game without supercell 's express written consent . 

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