Elon Musk responded positively to an underrated business idea involving the Cybercab and Optimus.The idea involves using the inactive Cybercab fleet at night for autonomous deliveries with the help of Optimus humanoid robots.The design of the Cybercab with a large trunk makes it suitable for a parcel delivery business, complemented by mass production of the Optimus robots.This potential dual-use of the Cybercab and Optimus could expand Tesla's business horizons beyond autonomous robotaxi services.