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