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