Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
placing a pre-order does not guarantee delivery of a service . 

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