Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you may not assign , delegate , or transfer these terms , by operation of law or otherwise , without fitbit 's prior written consent . 

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