Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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( 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: ['Limitation of liability' 'Choice of law' 'Arbitration'
 'Unilateral termination' 'Unilateral change' 'Content removal' 'None'
 'Contract by using' 'Jurisdiction'].