For the same reason naturopathic doctors were being murdered. I hope RFK Jr investigates that. Frank Suarez was a treasure amongst Spanish-speakers.
And when they get too popular, they get censored (Eric Berg) and/or their content disappears (Joel Wallach).
I have been getting good results with Dr. Mandell. He keeps it real simple. Berg is great as well.
https://www.youtube.com/user/motivationaldoc