Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
fitbit may change or discontinue , temporarily or permanently , any feature or component of the fitbit service at any time without notice . 

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