Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we may give notice to you at the e-mail address you provide to us when you register , or in any of the ways specified in section 13.7 above . 

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