Can you cite this? All I see is that BigThink is owned by FreeThink [0], and FreeThink appears funded by Bedrock Capital and MaC Venture Capital [1], neither of which I can tell are associated with the Charles Koch Foundation [2][3].
That said, I've spent ~5 minutes on this, so I certainly missed something.
[0] https://bigthink.com/our-mission/
[1] https://www.crunchbase.com/organization/freethink-media/comp...
[2] https://www.linkedin.com/company/bedrockcap/
[3] https://www.linkedin.com/company/mac-venture-capital/