We call them "big scrollies" in my newsroom, I have also seen the format referred to as "Scrollytelling". There are a few libraries such as graph-scroll and scrolllama which work well with d3 specifically, but otherwise you can just make your own.
What's your source for this? The only large court case involving a casino in Australia that I know of is the Crown and Aristocrat case, and the judgement hasn't actually been handed down yet.
This isn't scrolljacking. Scrolljacking generally refers to modifying the normal or expected scrolling behaviour. This has a single sticky section floated over the top of a normally scrolling page.