Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we encourage you to review the terms from time to time to ensure that you understand the terms and conditions that apply to your access to , and use of , the services . 

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