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