Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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headspace memberships and subscriptions are not transferable and therefore can not be sold or exchanged or transferred in any way whatsoever . 

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