Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( e ) you will not collect usernames and/or email addresses of users for the purpose of sending unsolicited email . 

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