Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
all purchases and redemptions of virtual items made through the service are final and non-refundable . 

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