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 . 

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