The key is to start small - throw away money for the victim so they don’t think it through.
Then you progressively ask for larger amounts working the victim over with the sunk cost fallacy.
It doesn’t take much, the victim naturally doesn’t want to admit they fucked up, and you can reinforce that so they think they’re doing the right thing by investing more money.
Keep it up until they are bankrupt, then disappear.
People have invested years I their twitter profile. They don’t want to admit it was a total waste of time.