As soon as I entered General Intuition’s R&D floor at its New York office, the company’s 31-year-old co-founder and CEO Pim de Witte directed my attention to a monitor perched on a standing desk. Someone appeared to be playing something like Fortnite. It wasn’t a person. “Our agent has been playing for 100 hours straight,” Kent Rollins, the company’s chief product officer, said, beaming. Before I could get absorbed in the spectacle of an AI navigating the game’s virtual environment, I heard the ...