It's not one thing, but its the combination of his apparent agenda coupled with his background.
With that said, if Google decided to promote planned parenthood links and hid southern baptist links, then I'd probably believe that politics might have something to do with it.
Everyone has a bias. But its important that you be able to see through their front to see what might be their actual end goal that's consistent with their bias.
I.e., don't you think it's possible that his individualist, pro-free thinker views inform both his libertarian political views and also his views that our rigid college-based gatekeeping system is unnecessary?
Probably not since one doesn't naturally flow from the other. Especially since he creates and participates in a several other gatekeeping systems.
Peter Thiel as a libertarian is depressed simply because, despte being white and rich, he can't find a way to deprive other groups of some basic civil rights. What freedom do you have if you can't deprive others of theirs? Indeed Mr. Thiel.
If you are making statements like this, you clearly know nothing about either libertarianism or Peter Thiel.