Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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5.6 airbnb may offer hosts the option of having professional photographers take photographs of their host services , which are made available by the photographer to hosts to include in their listings with or without a watermark or tag bearing the words `` airbnb.com verified photo '' or similar wording ( `` verified images '' ) . 

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