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