Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
`` payment service provider '' means a third party payment service provider as contracted by linden lab in its sole discretion . 

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