Sharing only creates demand if money or other videos (or other things of interest to the original perpetrator) are given in exchange. And honestly, I expect the vast majority of abusers to be doing it either for fun (so they'd stop sharing videos, but keep raping) or for the money. Sometimes I wonder if what people really want is just to stop the transmission of child porn so they can go back to pretending it doesn't exist...

Child porn piracy is an essentially victimless crime.

Note: In the above I am considering the generic example of "child porn" to be broadcasting the forcible rape of prepubescents, not 17 year olds sending each other naughty pictures, which is what most content matching the US legal definition is (the UK one is just stupid as it includes drawings).