Likening any of this to Volkswagen emissions compliance scandal does a huge disservice by treating "Affiliate Marketing" as far too important.
"Who gets a kickback on this toothbrush" is a much MUCH less important question than "do you pollute the air we are all breathing".
These are the same types who have poisoned the well of information that was the Internet you can actually find things on for the sake of the ad driven model. Far as I'm concerned, the moral injuries are the same even if the physical details are different.
It's comparing Honey's behavior to a well-known and comprehended scandal. Simile is a tried and tested way (hah!) to explain otherwise potentially hard to understand or dry content.
It's not about the severity of the impact, its the fact that they were breaking the rules and explicitly coding to actively avoid being caught by testers.