Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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choosing to do so is purely optional , and the decision to allow this information to be linked can be disabled ( with the third party site ) at any time . 

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