Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
unsolicited promotions , mass mailings or `` spamming '' , transmission of `` junk mail '' , `` chain letters '' , political campaigning , advertising , contests , raffles , or solicitations ; 

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