I searched for studies about while gains and can only find some claiming benefits, like https://pmc.ncbi.nlm.nih.gov/articles/PMC9777732/, https://pmc.ncbi.nlm.nih.gov/articles/PMC5310957/ and https://www.bmj.com/content/353/bmj.i2716 (I searched for “whole grain study” to not bring a bias into it). The effect of fiber in diet is generally seen as positive as being easily digestible isn’t the only metric. Raw sugar can be digested really easily, yet a diet consisting solely if it is usually not suggested or recommended.

They said “used by”

Which term isn’t used by “capitalists” to deceive you?

Most “capitalist” products here use refined grain. Almost no brand uses whole grain. For comparable products, the price of whole grain vs refined is basically the same.