Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
supercell may revise the pricing for the goods and services offered through the service at any time . 

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