It's there for the sub-set of people who truly care, or want to socially signal that they care. It's like... Tony's Chocolonely or any of the fair trade centric chocolates. They exist, they make sales, and you know who blows them out of the water every year? Nestle. Mondelez.
For every person who goes to Whole Foods and checks the labels, there are thousands of people who go to Wal-Mart or Costco and the only thing they check is the price.
Tony's Chocoloney had to stop marketing their chocolate as the only chocolate that doesn't use slave labor because they couldn't guarantee it.
Unless you're literally flying over to vet suppliers yourself, there's practically nothing you can do as a consumer to guarantee you're not being lied to.
Frankly, maybe this is an opportunity for an OSINT org. Just as soon as they stop having all these wars of aggression with professional misinformation campaigns to focus on, of course.
For every person who goes to Whole Foods and checks the labels, there are thousands of people who go to Wal-Mart or Costco and the only thing they check is the price.