Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the rights you grant us in this section 5 are only for the limited purpose of offering and improving the fitbit service . 

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