https://techcrunch.com/2021/05/27/tesla-has-activated-its-in-car-camera-to-monitor-drivers-using-autopilot/

Tesla has enabled the in-car camera in its Model 3 and Model Y vehicles to monitor drivers when its Autopilot advanced driver assistance system is being used.

In a software update, Tesla indicated the “cabin camera above the rearview mirror can now detect and alert driver inattentiveness while Autopilot is engaged.” Notably, Tesla has a closed loop system for the data, meaning imagery captured by the camera does not leave the car. The system cannot save of transit information unless data sharing is enabled, according to Tesla. The firmware update was cited by a number of Tesla owners,  industry watchers and bloggers who are active on Twitter.