As much as i hate meta and the rest, this is really a personal failure. Everyone knew that this would happen and everyone kept uploading all their unsecured biometric info to the public internet. This would be feasable, no matter how cool and open social media platforms are.
Its not solveable by any other means than not publishing the data in the first place. Getting existing biometric scramblers for image and audio data into the hands of the public is the big first step that would be necessary to solve this.