Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the nintendo account is personal to you and you may not sell , trade , assign or otherwise transfer your nintendo account to any other person or entity . 

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