System design interview question
"Design the backend for a website blocker — the kind used for focus, parental controls, or workplace policy. Users define what is blocked; the block must apply across all of their devices; and the user is often the person trying to defeat it."
designing against a motivated local adversary who controls the device. The interesting tension is that the person being restricted is frequently the account owner, so the threat model is unusual, and the honest answer distinguishes between enforcement that is technically robust and enforcement that is deliberately just inconvenient enough.
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