Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
any notices or other communications provided by fitbit under these terms , including those regarding modifications to these terms , will be given : ( i ) via email or ( ii ) by posting to the fitbit service . 

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