No doubt, spamming is a practice that people hate. Whether it's as unethical as what's being alleged against CA is another matter, though. AFAIK, there was nothing when signing up for the quiz app that said your data would be used for political purposes. At most, the quiz might have been said to be affiliated with a Cambridge professor and his studies [0].

[0] https://www.gsb.stanford.edu/sites/gsb/files/conf-presentati...