Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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you also acknowledge that your submissions will not be returned to you and that headspace has no obligation to acknowledge receipt of or respond to any submissions . 

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