Paraguay's president resigned Thursday after the collapse of the country's largest digital bank locked 3 million people — 60% of the adult population — out of their own money, a warning shot about what happens when digital finance and political power become the same machine.

The crisis proves what populist skeptics of central bank digital currencies have argued all along: when your money exists only as digits on a state-controlled app, it can be zeroed out overnight. No cash fallback. No branch to storm. Just a screen reading,