Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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( b ) headspace offers monthly , annual , two year and forever subscription options . 

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