Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you retain all rights to your content that you post to the fitbit service . 

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