Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
other than as expressly authorized in the service , you shall not sell , purchase , redeem or otherwise transfer virtual items or merchandise to any person or entity or attempt any of the aforesaid , including but not limited to supercell , another user or any third party . 

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