[jleader]

Sometimes the "bad edge" effect is cumulative over time. This can lead to a new entrant to the market suddenly gaining a lot of market share, because so many people have gotten fed up with the dominant player. So maybe the dark patterns work well, until suddenly they nose-dive, because everyone's switched to the less annoying alternative.

A/B testing only tells you what works today, not what's going to keep your customers satisfied in the long run.