Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
all notices given by you or required from you under these terms of service or the supercell privacy policy shall be in writing and addressed to : supercell oy . 

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