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The European Union's General Data Protection Regulation (GDPR) requireswebsites to ask for consent to the use of cookies for \emph{specific purposes}.This enlarges the relevant design space for consent dialogs. Websites could tryto maximize click-through rates and positive consent decision, even at the riskof users agreeing to more purposes than intended. We evaluate a practiceobserved on popular websites by conducting an experiment with one control andtwo treatment groups ($N=150$ university students in two countries). Wehypothesize that users' consent decision is influenced by (1) the number ofoptions, connecting to the theory of choice proliferation, and (2) the presenceof a highlighted default button (``select all''), connecting to theories ofsocial norms and deception in consumer research. The results show thatparticipants who see a default button accept cookies for more purposes than thecontrol group, while being less able to correctly recall their choice. Afterbeing reminded of their choice, they regret it more often and perceive theconsent dialog as more deceptive than the control group. Whether users arepresented one or three purposes has no significant effect on their decisionsand perceptions. We discuss the results and outline policy implications.

Multiple Purposes, Multiple Problems: A User Study of Consent Dialogs after GDPR