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