Dashcams are already regulated in Germany and Austria. People have been ticketed for always on dash cams; only those that are triggered activated (button pushed or shock detected) are allowed. (And yes, I know they use a buffer)

And even without that, there are other laws that would make it illegal for Tesla to just download cam footage without solid reasons. Hell even GDPR would apply, as it would contain personal information (license plates), and the penalties are severe ("€10 million, or 2% of the firm’s worldwide annual revenue from the preceding financial year, whichever amount is higher").