We don’t know precisely when the ICIJ began to get the info that led to many investigations. But we do know that it’s been happening since 2013, at least.
They ‘followed the money’. This phrase gained popularity after the Watergate scandal. But tracking money has been vital for uncovering who’s behind the shadiest business in the world since long before Nixon. The problem is that power, greed, and corruption can sweep even the deepest trail.