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