In New York City, where almost nothing is free, a startup called Shift Robotics is offering to clean your apartment for $0. There is, of course, a catch: The cleaners wear head-mounted cameras that record first-person footage as they do dishes, mop floors, and fold laundry. That footage is turned into training data for AI labs and robotics companies. Few people had heard of Shift before last week. Then its launch video went viral, drawing more than 8 million views. The initial 250 cleaning