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' 'Unilateral termination'
 'Limitation of liability' 'Content removal' 'None' 'Arbitration'
 'Jurisdiction' 'Contract by using'].