Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
each unique user must represent a person and not any sort of automated bot or set of people . 

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