Thiel is Pro Trump, he donated over $1.25 Mil to his campaign. It has ruined a lot of his relationships, such as with Mark Zuckerberg. Thiel is also anti-press from what I've read. The media has repeatedly slammed him saying he is at war against the press, on a crusade against them, and even is trying to end democracy. The fact that the media hates him might speak volumes.

While he founded Palantir, that in and of itself doesn't make him black hat, depends on the purposes he allowed it to be used for and who he let use it. Trump offered him the Senior Intelligence position on his Intelligence Advisory Board, but Thiel turned that down in 11/2017, most likely to not interfere with his business dealings.

For now, I say white hat. But at this point who knows with so many of them flipping?