Google Chrome silently installs a 4 GB AI model on your device without consent. At a billion-device scale the climate costs are insane. — That Privacy Guy!

Google Chrome silently downloads a 4 GB Gemini Nano LLM weights file to users' devices without consent, stored in a directory called OptGuideOnDeviceModel. The file re-downloads automatically if deleted, with no accessible opt-out for regular users. The author provides forensic evidence from macOS filesystem events confirming the install happened on a profile with zero human interaction. Legal analysis argues this breaches ePrivacy Directive Article 5(3), GDPR Articles 5(1) and 25, and potentially CCPA. A detailed environmental analysis estimates the one-time delivery cost at 6,000–60,000 tonnes of CO2e depending on deployment scale (100M–1B devices), equivalent to the annual emissions of 1,300–13,000 cars. The post also highlights that Chrome's visible 'AI Mode' pill routes queries to Google's cloud servers, not the local model, creating a deceptive impression about on-device processing. The author calls for explicit opt-in consent, persistent deletion respect, transparent documentation, and retrospective notification to affected users.