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User interface channels and manipulates your behaviour. The more minimal the UI, the stronger the manipulation it has the stronger effect. When UI aims to minimise your options, who decides what those options are? What are their incentives, their biases, their reasoning? In short: who is channeling your behaviour? In the modern, minimal UI is more like Kirkegaard and Aristotle, and what ethics in technology is modern, is minimalism. Any company that buries data and buries personal data is ethical.