Additionally plenty of people making videos for YouTube have had their videos demonetized and their channels even removed because of the Content ID copyright detection scheme and their three strikes rule. In some cases to a ridiculous extent - some companies will claim ownership of music that isn't theirs and either get the video taken down or take a share of the revenue.
I watched a video where someone wrote a song and registered it via CDBaby, which YouTube sources for Content ID. Then someone claimed ownership of the song, so YouTube assigned the third party 50% of the ad revenue of the video.