Exception: mathematical ideas which are difficult to come up with.
When these techniques were in development, in the golden era for spirituality, most of the rest of the world were still hunter-gatherers. Empirical rigor was just not a thing.
It's a question of providing due credit for those who developed and practice these techniques as a way of life. If not share some of the capitalistic spoils in the billions from delivering stress relief(meditation based content) through shiny, addictive apps (Yes, meditation apps can be addictive! Surprise! i.e, Headspace, Calm), At least provide credit where it's due.