Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
please note that if you purchase a subscription through the apple itunes store or our iphone application , the sale is final , and we will not provide a refund . 

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