Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( f ) you will not engage in criminal or tortious activity , including fraud , spamming , spimming , sending of viruses or other harmful files , copyright infringement , patent infringement , or theft of trade secrets or attempt to impersonate another user or person . 

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