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 . 

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