Significant part of camrips now is sponsored by non-licensed gambling operators who literally pay tens of thousands dollars to bootleggers who can film latest releases and bring recording to them on exclusive basis. There’s even some habitual bootleggers who film camrips for their living. So when you watch camrip of the latest hollywood title which is spammed with gambling ad watermarks then most likely this casino/betting operator has paid someone to record the screening.
I had the same question dozen years ago when was taking part in publishing one book (in my translation from French). Publishing house finally used phrase which in English should sound like: “Not protected by copyright law”.