This is more of a YouTube thing. They are very trigger-happy on copyright and implement a "strike" system that will quickly get you demonetized. It's fairly easy to file a strike against anyone and the target has little recourse other than taking down the video even if it has nothing to do with copyright.

It's not DMCA so you don't even have the right to counter-file. And of course since it's Google there's no one you can call or email to get real help unless you're a super popular channel with an assigned rep.