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