Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
please note that gifting codes can not be redeemed if the recipient has already purchased a subscription through the apple itunes store or our iphone application , or the google play store or our android application . 

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