Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
selling , trading , assigning , licensing , or otherwise conveying virtual property for real money or for funds credited to a nintendo account , where `` virtual property '' refers to any features of games or other content that can be traded with other users for free or for in-game virtual currency ; 

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