But Satan still wins if they knowingly accept it or have a strong suspicion where the money came from. The warfare is fought in you and among the parts of society that are around you, every day. The world is in revolt, but it is still the Creator's world, and the Devil can't change that. The Greek New Testament term for 'possession' is daimonizomai , which can be seen several ways. One way is to see it as demonic influence, where one is so twisted up by the devil that one becomes 'demonized' - made like the Devil.
Bondage is created either way.
It takes the bigger dynamism of Christ to free someone from that bondage, and it takes 'Christ-ization' to keep them free. But mere factual knowledge, standing on its own, can't do anything to the Devil. The more we know, the more places that Satan can grip in order to twist our minds. And even if somehow you were able to know how to stop Satan from twisting your knowledge, Satan could still get at you through your body, with accident or tempting sensations or illness. And so on.