Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you agree that we may notify you of the updated terms by posting them on the service , and that your use of the service after we post the updated terms ( or engaging in other such conduct as we may reasonably specify ) constitutes your agreement to the updated terms . 

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