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