The Fed always can return the money, because they control how much money is printed. Therefore, the money loaned to the Fed through the overnight rate is risk-f

The Fed always can return the money, because they control how much money is printed. Therefore, the money loaned to the Fed through the overnight rate is risk-free. That's why its called the risk-free rate. It may only be a singular day worth of bond / IOU, but its still a loan/bond/debt instrument. ------- Similarly, the Ethereum rewards are printed out of thin air, are they not? By the Ethereum staking system? Its not like the Ethereum they print existed beforehand.