Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
additional terms and conditions may apply to surveys , contests , giveaways , and other promotions sponsored by fitbit or its partners . 

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