Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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virtual credits , points , or tokens as further described in each applicable product policy ( `` virtual tender '' ) associated with your account that were purchased with u.s. dollars or other accepted fiat currency may be used or exchanged before virtual tender associated with your account that was not purchased ( e.g. , virtual tender that was earned through experiential play ) , no matter when that virtual tender was acquired . 

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