Cambridge Analytica didn't make or market such an app to them. It was some academic who made the app and then turned around and sold the data. This academic has

Cambridge Analytica didn't make or market such an app to them. It was some academic who made the app and then turned around and sold the data. This academic has now been largely erased from the story, presumably because journalists tend to like academics and anyway "one guy screwed up" is not a story whereas "clash of the corporate titans" is.