Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
these items are not redeemable or subject to refund and can not be traded outside of the services for money or other items for value . 

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