Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the provision of virtual items for use in supercell games is a service provided by supercell that commences immediately upon acceptance by supercell of your purchase . 

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