There is no such thing as free money. Even if the cost of borrowing was literally zero, money borrowed would still have to be returned.
The risk is that money that goes thru the fractional reserve banking system and that gets subsequently loaned out to businesses and individuals gets destroyed due to inability of businesses to pay back due to insolvency, bankruptcy, or low corporate profits. All these can easily happen in a time when global demand has taken a major hit and the world economy is headed to recession.
We need governments to literally print money by issuing government debt and using the proceeds to invest in infrastructure as well as business support, and further wage support.