tl;dr: Meta has paused its Model Compatibility Initiative (MCI), a tool deployed to US employees in April that captured mouse movements, keystrokes, click locations, and screen content to train AI systems on human computer use. The pause follows an internal security incident where MCI-collected data was accessible to other Meta employees; an initial fix on June 18 failed to hold, prompting further lockdowns. Employees had been petitioning against the program over privacy concerns, and opt-outs were only added after protests.