One-size-fits-all: a broader market = more revenue. If it's not working, it's your fault. Therefore the product, coaching programme, "guru" etc. are 100% infallible.

A very cunning trick pseudo-scientific self help movements and gurus over the world have been using at great benefit (for themselves) for generations:

https://medium.datadriveninvestor.com/law-of-attraction-and-the-self-help-industry-are-rotten-from-the-inside-68a0c99763fb