Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the fitbit service is not intended to diagnose , treat , cure , or prevent any disease . 

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