Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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• advertise or solicit others to purchase any product or service within the vimeo site ( unless you are an official vimeo partner or advertiser and have a written agreement with vimeo ) . 

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