Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
vimeo may block your email address and internet protocol address to prevent further registration . 

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