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