Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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certain aspects of the service ( including subscription to a premium account or usage of virtual environments ( `` virtual space , '' as may be further described in an applicable product policy ) ) , are provided for a fee or other charge by linden lab or an applicable payment service provider . 

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