“My neighbors think I’m under house arrest,” observes Arjun Sethi. It’s not hard to see why. On the driveway of Sethi’s comfortable Menlo Park home, located a few miles from Stanford University, sits a black Cybertruck that rarely leaves. Meanwhile, various figures stream in and out of a wide open garage anchored by a table littered with electronics. Inside, there are no pictures on the walls and the domicile’s only personality is supplied by a large German Shepherd patrolling the backyard. Seth...