A while back I noticed that a bunch YouTube channels use the same stock music, and my brain gets confused every time "toy review music" suddenly shows up as "cooking montage tune".
I wondered why YouTube didn't set up a system to connect independent musicians with video creators, so everyone in the chain could benefit. Indie artists get discovered, video creators get more varied music to match their content, and YouTube makes money off of brokering the deals, while also cutting down on the number of copyright complaints. Then I realized that such a system would cut the RIAA out of the picture, and major record companies really do not want YouTube to help people discover music they don't control.