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