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