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