[TeMPOraL]

How many people end up paying for something because they couldn't be bothered to cancel the deal after the free period is gone? It's an age-old sales tactic, used in everything from magazine subscription to Spotify (of not cancelling the last one when I no longer needed it I'm guilty myself).

And I think the mental equivalent of drinking bird is actually very much in the spirit of the experiment - the point is, people can't reliably do even something as simple as deciding to refuse no matter what and keeping the commitment.