They’re making it easier to swap debt for cash (temporarily), so no one panics because they can’t get a loan fast enough in USD.
The ability to do so is key for a great many financial operations.
Why is it a temporary thing? Seems like all upside?
Well the debt is worthless so one but the FED can afford to buy it.
Banks have a bunch of assets (mortgages, long-term government debt) that still has its full value, but only 10 years later, people want their money out now, the Fed is issuing bridge loans to cover the gap and avoid bank runs.