A Pyramid of Bullshit
A California man has been sentenced to 6 years and 9 months for a scam where he took money from investors for non-existent anaerobic digestors at big dairy farms. In classic pyramid scheme style, money from later investors paid out imaginary dividends to earlier ones.
https://www.theguardian.com/us-news/2023/jun/27/us-man-cow-dung-scam-prison