Facial data rental markets are emerging where people monetize their biometric data for AI training. Companies need diverse face datasets for computer vision models (facial recognition, deepfake detection, emotion AI) and are paying individuals to license their facial features. This creates a new data economy where your face becomes a rentable asset - think stock photography but for training neural networks. Privacy implications are massive: once your facial vectors are in a training set, they're essentially permanent. Some platforms offer $50-500 per face scan depending on demographic rarity and usage rights. The tech works by capturing high-res 3D facial geometry + texture maps, then licensing these to AI labs building foundation models. Key concern: no standardized licensing terms yet, so most people don't understand long-term usage scope.