The scam consists of getting the mark to deposit money in https://coinexab.com. And that website, it seems like, keeps the money they get, and the scammer gets a kickback in someway.
It seemed to me that the scammer was operating off some kind of script / instructions. So maybe that's how they are recruited or trained?
They all seem to use the name Anna Grace, and are trained to pick someone from a set of packages who they can pass for. The package contains pictures and other documents they can use to prove their identity. They are trained to make very short calls to the mark, with video on. So they do have to pass for the person in the pictures that they send you. But they are clearly not that person.