Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
22.7 unless specified otherwise , any notices or other communications to members permitted or required under this agreement , will be in writing and given by airbnb via email , airbnb platform notification , or messaging service ( including sms and wechat ) . 

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