That's not a bad starting point for a minimal definition. Would you also include things like slavery and child labor?
Yes, I will (obviously) concede such things where the use of force is involved .. also extortion etc.
So, what about using someone's frailties against them. Doing a time-constrained, cleverly marketed and salesman pushed, complex contract product agreed to by someone just this side of the line of legal competence due to low IQ?