Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
2.4 user verification on the internet is difficult and we do not assume any responsibility for the confirmation of any member 's identity . 

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