>Just because Google demonetises your video and sends a share of ad revenue to Sony/Warner/whoever, that doesn't mean you _didn't_ infringe copyright.

Nor does it mean you did infringe copyright. There's no direct correlation between one and the other. You can't use the function of Content ID to infer things about how Copyright works.

Content ID may be ABOUT copyright, but in no way is it TIED to copyright.