Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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such third-parties may charge a fee for use of certain content or services provided on the website . 

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