A software engineer in Spain had the surprise of his life when he found himself in control of thousands of robots in what was supposed to be a pet project. Sammy Azdoufal set out to customize his new Chinese-made DJI Romo robot vacuum, a high-end autonomous cleaner that comes with a price tag of $2,000 that maps homes, mops floors, and navigates obstacles with onboard sensors, according to Popular Science.