Strictly speaking, we cannot say for sure they didn't predict the corruption -- merely that they didn't warn about it.

For all we know, they're participating in the corruption, which is why they were outspoken proponents.

Of course they're participating, even driving it. Notably there were large bets placed predicting imminent military actions in Iran and Venezuela. In at least one case it was verifiably placed by one of the individuals planning it. We've reached the point where our country's leaders can profit not by the outcome of the war, but even just by the very act of initiating it.