Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we do not waive any rights to use similar or related ideas or feedback previously known to us , developed by fitbit , or obtained from sources other than you . 

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