Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
introductory offers are only available to new users of the products , except where expressly stated otherwise . 

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