Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
to access and use certain features of the services , you may be required to register for an account . 

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