[Apocryphon]

I mean, they might just be a class of frauds that are currently legal thanks to lack of will to close a particular loophole that permits their existence. And it's not as if they don't receive legal penalties all the time:

https://heavy.com/news/2020/08/herbalife/

https://www.cs.cmu.edu/~dst/Amway/AUS/hanrahan.htm