Module 5: Ethics

Nudges and dark patterns

Learning objectives: By the end of this module, you will be able to:

Distinguish a legitimate nudge from a dark pattern using the criterion of who benefits.
Identify the most common dark patterns in real products.
Hold an uncomfortable conversation when the dark pattern is in your own product.

Estimated time: 1-1.5 hours

This course taught you to read how people perceive, remember and decide. That same information can be used to help people or to exploit them. There's no switch that separates the two uses: it's the same knowledge. That's why the last module is about ethics, and not as an appendix but as part of the craft.

Here we're fully into social and persuasion psychology. The question that organizes everything is uncomfortable and doesn't always have a clean answer: when does helping someone decide turn into manipulating them?

5.1. The waiter analogy

A waiter can push you toward a dish in two ways. They can recommend the one you'll enjoy most, because they know the menu and want you to come back: that's a nudge. Or they can steer you to the most expensive dish you'll regret, because the commission suits them: that's a dark pattern. The gesture looks almost the same: a suggestion, an "I'd recommend…". What changes is who it plays in favor of.

A nudge arranges the decision you were going to make anyway: it puts the healthy option at eye level, but the cake is still available and in plain sight. A dark pattern uses what it knows about your head against you: it hides the exit, shames you for choosing well, charges you for something you didn't ask for. Same psychological mechanism, different owner of the benefit.

5.2. How to locate the line: four questions

In whose favor? If the suggested action mostly serves the user, it's a nudge. If it serves the business at the user's expense, it's dark.
Does it preserve freedom of choice? A nudge leaves the other option available and visible. A dark pattern hides it, penalizes it, or makes it tedious on purpose. The classic: easy to subscribe, painful to cancel.
Is it transparent? If the mechanism collapses when the user notices it, it's manipulation. An honest nudge survives being explained out loud.
Is it reversible without punishment? Being able to undo without artificial friction is a sign of a nudge.

The most common dark patterns

They have their own names, most of them coined by Harry Brignull:

The "roach motel": easy to get in, impossible to get out.
Confirmshaming: they shame you for declining ("No thanks, I'd rather pay more").
The "sneak into basket": they add something you didn't ask for.
"Forced continuity": the free trial that starts charging on its own without warning.

Its limit: this line isn't always sharp, and it's worth admitting that. There's a real gray zone. Turning on two-step verification by default benefits the user even though they didn't ask for it: nudge or imposition? A pre-checked newsletter opt-in is more debatable than obvious confirmshaming. Ethics here isn't a checklist: it's a judgment you exercise, and reasonable people disagree about the gray cases. Mark the gray as gray instead of forcing a verdict.

5.3. Case study: "SubscribeEasy" (subscription)

SubscribeEasy had polished its sign-up until it was instant: one tap and you're in. Cancelling, on the other hand, required going into a hidden menu, getting through three retention screens and confirming within a narrow time window. The same team that in Module 2 would have celebrated "less friction" was using it in reverse: adding friction, on purpose, only at the exit.

This is a textbook dark pattern (the "roach motel"), and it's not a design accident: it's built with the knowledge from this course. Friction, status quo bias, the weight of the ending we saw in peak-end, all put to work against the person.

The research role here is uncomfortable. When the dark pattern is in the product that pays you to research it, naming it has a cost. But a report that describes the asymmetry between subscribing and cancelling, and calls it by its name, is more honest and, in the long run, more valuable for the business itself: these patterns erode trust and today they also attract regulatory scrutiny in several jurisdictions. Telling the uncomfortable truth is, as far as I've seen, the part of the job that costs the most and defines it the most.

5.4. Application activity (15 minutes)

In a product you use every day, find one nudge and one dark pattern.

Run them through the four questions: benefit, freedom, transparency, reversibility.
Note which of the two was harder to classify.

Suggested solution: the easiest dark pattern to find usually lives in cancellation or in the opt-out. The honest nudge is usually in the defaults that protect you: saving your progress, turning on backups. If you hesitated over whether something was gray, it probably was: write it down as gray, don't force the verdict. That muscle, tolerating ambiguity without resolving it by force, is the one this module is trying to exercise.

5.5. References

Thaler, R. H., & Sunstein, C. R. (2008). Nudge: Improving decisions about health, wealth, and happiness. Yale University Press.
Brignull, H. (2023). Deceptive patterns: Exposing the tricks tech companies use to control you. See also deceptive.design.
Gray, C. M., Kou, Y., Battles, B., Hoggatt, J., & Toombs, A. L. (2018). The dark (patterns) side of UX design. Proceedings of CHI '18.

Additional material. From MIT's Introduction to Psychology (9.00SC): Social Psychology I and Social Psychology II, the foundation of influence and persuasion.