Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you set up an associated nintendo account for your child below the age of 13 , the receipt for any transactions that take place through the child 's nintendo account will be sent to your email address . 

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