Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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supercell reserves the right , at its discretion , to change , modify , add or remove portions of these terms of service , its privacy policy and other relevant supercell policies at any time by posting the amended terms on the supercell service . 

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