Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in some cases , these communities may supplement these terms with their own terms and conditions . 

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