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' 'Unilateral change' 'Jurisdiction' 'Arbitration'
 'Contract by using' 'Unilateral termination' 'Limitation of liability'
 'Choice of law'].