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