Money is pouring into artificial intelligence startups even when little more than a pitch deck exists. The surge is raising questions about how companies without revenue are reaching multibillion-dollar valuations, including from Google DeepMind co-founder and CEO Demis Hassabis. "They're raising at tens of billions of dollars in valuations just out of the gate," Hassabis said on a recent episode of "Google DeepMind: The Podcast," pointing to AI startups with limited traction as evidence that some corner ...