Obama campaign pioneered tactics used by Cambridge Analytica.
adage.com
adage.com
In this case the app was purported to do one(create your own psychological profile or some such nonsense) but instead stored and used the data for unrelated purposes (campaign targeting, pretty clearly unrelated to the stated purpose).
We can go on and on about “people should know that they’re the product”, but that only goes so far - you can explicitly say “this is what we’re doing with your data” and then do something else.
If anyone remembers the flood of spammy apps that used to be commonplace Facebook, those were built off of access to your friends lists. All you needed was one of your friends to play poker or take a quiz, and your personal information would be siphoned up by the app maker.
It’s unclear whether the users who took part in the sham academic study paid for by Cambridge Analytica will be able to obtain any legal remedy, but it seems pretty clear that what they were being paid for was not taking a quiz, but rather for access to hundreds of their friends’ information.
Edit:
It seems that these restrictions were implemented in 2015: https://techcrunch.com/2015/04/28/facebook-api-shut-down/. However, Facebook’s “platform policy” at the time did prohibit using data of a user’s friends for advertising (https://www.theguardian.com/news/2018/mar/17/cambridge-analy...).
Actual title: "Facebook Tool the Obama Camp Called Groundbreaking is Going Away"