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