Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we have the right to investigate violations of these terms and any conduct that affects the fitbit service , and in response may take any action we may deem appropriate . 

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