There were. Lots of them. So much so that both Herbalife and Amway have been under numerous consent decrees with the US government for decades [1][2]. [1] htt

There were. Lots of them. So much so that both Herbalife and Amway have been under numerous consent decrees with the US government for decades [1][2]. [1] https://www.ftc.gov/news-events/news/press-releases/2016/07/herbalife-will-restructure-its-multi-level-marketing-operations-pay-200-million-consumer-redress https://www.ftc.gov/news-events/news/press-releases/2016/07/... [2] https://www.govinfo.gov/content/pkg/FR-1994-03-23/html/94-6730.htm https://www.govinfo.gov/content/pkg/FR-1994-03-23/html/94-67...