So are taxpayers now backstopping hundreds of billions of uninsured corporate deposits?

While share holders and bond holders are SOL. the Fed is coming up with the money for depositors. But where is that cash coming from?

From future costs passed on to all bank depositors across all banks. Contrary to Biden's thinking, those depositors are taxpayers.

Will the Fed just print more money, resulting in devalued dollar? What about the other $620B paper losses at other banks?

How does $620B get passed on as increased banking fees/interest rates? Where does the short term cash come from before those future revenues materialize?