Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
fitbit is not liable for any loss or damages caused by your failure to maintain the confidentiality of your account credentials . 

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