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