Market pressure from consumers require that an overwhelming majority of consumers investigate what they are buying to an unreasonable level.

And companies with a lot of money will just pay to spread information or misinformation, making it even more difficult to make decisions as an informed consumer, even if you want to. Not just talking about commercials or PR statements, this goes all the way to paying research institutions sponsor money for specific projects.

Companies that don't fulfill a certain market certification can just create their own certification and market it to consumers. Showing off a shiny sticker that they are fulfilling what the market wants, while the company hasn't changed it's practices. Not to mention the constant problem with "oh no, our subcontractor didn't do their due diligence so our sub sub sub contractor that used child slave labor has now been cut off".