There are about ~~1.5 Keto acolites on FB and reddit. By comparison there are only ~400 vegans...You can diminish/diminish/mock the testimony of the Keto followers all you want, but the results speak for themselves.
Because it is a fad. The low-carb fad reared it’s ugly head back in 2004 and faded out. Keto will as well. But it will do a lot of damage to people first. A hell of a lot of people smoked cigarettes at one time also.