Roughly the things to look up are private equity and their "bust out" strategy

https://www.youtube.com/watch?v=z5PLEZiSZV

https://www.youtube.com/watch?v=r3_41Whvr1I

https://www.youtube.com/watch?v=o10nh86q64Q

https://www.youtube.com/watch?v=n7VmIy0VXOY

Buy a company with debt (leveraged buy out). Hand that cash back to the "private equity investors". Let the company go bankrupt and the debt magically dissapears.

Basically legalized theft at enormous scale