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