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Self-Guaranteeing Promises
A self-guaranteeing promise does not require you to trust anyone. You can verify it yourself.
Changes can retroactively affect data you have spent years putting into the tool. A self-guaranteeing promise about privacy gives you proof that the tool cannot access your data in the first place. Even open source apps can rely on data that is stuck in databases or in proprietary formats that are difficult to switch away from.
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