A look at Manifest, an annual convention for prediction markets where many purists worry that Kalshi and Polymarket are undermining the technology's public good (Christopher Beam/Bloomberg)

Christopher Beam / Bloomberg: A look at Manifest, an annual convention for prediction markets where many purists worry that Kalshi and Polymarket are undermining the technology's public good — At Manifest, some tech intellectuals wondered whether Super Bowl bets were really helping humanity.