Omor Ibne Ehsan's 247wallst.com article reports that Kalshi, the $40 billion prediction-market startup, ended Donald Trump Jr.'s advisory contract on November 12, 2026, saying his firm 1789 Capital made a significant investment in rival Polymarket, talks that began in August. It also flags Robinhood, Kalshi's largest distribution partner, as the listed company most exposed to Democrats' promised looks at prediction markets and the Trump family.