The more interesting question is why various stodgy bankers gave him the other 28B.
Because that’s how the system works.
If you have $5,000 and owe 15,000, you’re in debt and most likely have to work a shitload of hours in a dead end job for the rest of your life in a futile attempt to make ends meet.
If you have 3 billion dollars and owe 30 billion, you’re a billionaire and get to do whatever you want consequence free, including breaking all of the laws.
Do it, you cowards!