alt Hacker NewsInvestor highlights for each platform:
Kalshi: Sequoia Capital, Paradigm, Andreessen Horowitz (a16z), Y Combinator, Charles Schwab, Henry Kravis (KKR), and CapitalG (Alphabet).
Polymarket: Intercontinental Exchange (ICE - parent of the NYSE), Founders Fund (Peter Thiel), Vitalik Buterin, and 1789 Capital (Donald Trump Jr.).
PredictIt: Primarily supported by Aristotle International (a political tech firm) and historically Victoria University of Wellington.
Donald Trump Jr.: Prominent investor in Polymarket through his firm, 1789 Capital, and serves as a paid strategic advisor to Kalshi.
The current CFTC Chairman, Michael Selig, created a 35-member panel to draft new regulations for prediction markets. This panel includes the CEOs of the platforms they regulate, such as Shayne Coplan (Polymarket) and Tarek Mansour (Kalshi).
These companies were blatant about operating illegally in the US. I remember being shocked to see the live billboard polymarket ads in Philadelphia on the eve of the election. I guess there are too many scandals these days for this to stand out.