Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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( ii ) post or transmit unsolicited or unauthorized advertising , or promotional materials , that are in the nature of `` junk mail , '' `` spam , '' `` chain letters , '' `` pyramid schemes , '' or any other form of solicitation that linden lab considers to be of such nature ; 

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