Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
some services may rely on services provided by third parties for some or all of their functionality . 

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