I have a suspicion that one of the factors holding back donations from big names (think Peter Thiel level), is the absence of visibility.
I don't think you can call Nick Bostrom not visible. He made Foreign Policy's Top 100 Global Thinkers list. He also wrote the book last year.
Many people have an incorrect view of the Future of Humanity Institute's funding situation, so this is a brief note to correct that; think of it as a spiritual successor to this post. As John Maxwell puts it, FHI is "one of the three organizations co-sponsoring LW [and] a group within the University of Oxford's philosophy department that tackles important, large-scale problems for humanity like how to go about reducing existential risk." (If you're not familiar with our work, this article is a nice, readable introduction, and our director, Nick Bostrom, wrote Superintelligence.) Though we are a research institute in an ancient and venerable institution, this does not guarantee funding or long-term stability.