Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
in the service you may purchase , with `` real world '' money , a limited , personal , non-transferable , non-sublicensable , revocable license to use ( a ) `` virtual currency '' , including but not limited to virtual cash or diamonds , all for use in supercell games ; ( b ) `` virtual in-game items '' ( together with `` virtual currency '' , `` virtual items '' ) ; and ( c ) other goods or services ( `` merchandise '' ) . 

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