Can someone explain this to me like I just woke up but really need to understand something technical as fast as I can?

Can someone explain this to me like I just woke up but really need to understand something technical as fast as I can?

I think its using computers to follow the money from EIN to EIN, EINs are the tax numbers for companies. That's just a guess.
Traveling/exploring a node-graph data structure like this (all EINs connected to each other directionally via transferring money) is a problem that scales poorly (exponentially). insights will take a while