the vast majority of times when a video is demonetized it's because of a 30second sondbite where some copyrighted music is playing in the background, even if it just the background noise at a mall or a store and would pass any sane non algorithmic test as fair use. And not because the intentional content breaks any rules.
A big part of that is due to the power the copyright cartels of non-creators(aka music and film distribution companies) have brought to bare on youtube due to the amount of music video's being streamed on the platform means that youtube cannot really afford to be a fair use supporter or try to code any fair use awareness into their algorithms(even if it was technically feasible).
I was ready to spec an ML-backed plugin that would use insights and algorithms from cocktail party problem [0] [1] to remove copyrighted audio from muxed video when a quick search for "post-processing audio to remove copyrighted music" yielded among its first few results a YouTube help link titled "Remove claimed songs from videos" [2].
A big part of that is due to the power the copyright cartels of non-creators(aka music and film distribution companies) have brought to bare on youtube due to the amount of music video's being streamed on the platform means that youtube cannot really afford to be a fair use supporter or try to code any fair use awareness into their algorithms(even if it was technically feasible).