FDIC insurance. A private insurance market for bank accounts sends a price signal about reliability. Subsidizing that insurance in a way that doesn't eliminate the price signal and the customer risk, like requiring 20% private insurance for 90% of the account face value and the govt providing the remaining 80% insurance at the same price or at a discount, could make sense if insuring more accounts was a policy goal. Having the government ensure everything for free with no internal price differentiation just tells banks they might as well go wild.