Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you shall use your account only for non-commercial purposes ; you shall not use the service to advertise , or solicit , or transmit any commercial advertisements , including chain letters , junk or spam e-mail or repetitive or misleading messages to anyone . 

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