Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you must not allow others to use your account credentials and you must safeguard the confidentiality of those credentials . 

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