Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
such third-parties may charge a fee for use of certain content or services provided on the website . 

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