Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you do not have an account , you accept these terms by using any part of the fitbit service . 

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