Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you purchase a subscription through the google play store , the sale is final and we will not provide a refund . 

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