That's because Thiel, who infamously supported the presidential campaign of Donald Trump, also happened to donate $1,000,000 in October of 2016 to the Super PAC Make America Number 1 — an organization that paid Cambridge Analytica $231,352 toward the end of the same year, an FEC filing shows.
That's the same Cambridge Analytica, of course, that worked on behalf of Donald Trump's campaign for president.
In other words, a portion of Thiel's wealth — some of which was derived from his early investment in Facebook — likely made its way into the coffers of Cambridge Analytica via Make America Number 1.
FEC documents show that between October 3 and October 19 of the same year Make America Number 1 paid out $323,908 to Cambridge Analytica — $20,000 of which was for "DATA ACQUISITION SERVICES." Remember, this is after Facebook discovered Cambridge Analytica had been in possession of ill-gotten Facebook data.
However, the fact that he co-founded Palantir — itself a data analysis firm — suggests he isn't naive about what a company like Cambridge Analytica could do with data profiles on 50 million Facebook users.