The hook was that you pre-pay some amount, do some trival work, then get like 500% return on your "investment". So they filter+train their mark by having them sign up for whatever financial transfer workflow, and figure out how gullable they are by giving them some payouts. A big part of this is some chat-group where lots of other fake-workers post comments saying how nervious/risky it seems and how sometimes the payment is delayed but they all eventually get paid. Eventually they let the mark sign up for some high-value amount, like equivalent of a few thousand USD. When the mark doesn't get paid, they contact the "technical support" team that then tries to social engineer the victim to loose even more money transferring funds the wrong direction (the scammers picked financial apps that make this mistake easiest).
I kind of find it unbelievable that people fall for this stuff, but the obvious proof is that enough people do :(