Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
should you elect to use paid aspects of the service , you agree to the pricing , payment and billing policies related to such fees and charges , plus vat or other taxes as applicable , as posted on the website ( s ) , application ( s ) , or by an applicable payment service provider . 

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