The quiz app wasn't the real data source though was it? People who want to take the quiz have to press "yes" on a menu that vaguely mentions "We need your friends list" and things like that, and those permissions were used to harvest the data as far as I understood, not the quiz itself.
Yes, the quiz was the bait to get to the real prize, your friends list and their info, likes, etc.
However, your answers to a different Facebook quiz in 2014 were scrutinized by Cambridge Analytica, who were looking for the “dark triad” of personality traits, scouting for sociopaths:
