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