When you upload a song, you indicate whether it has copyright and who owns it, Then, whenever its played they pay the copyright owner based on an audience size basis, similar to Spotify.
If you don't, the copyright owner informs Google, and they close that link.
Even if you have music playing in the background of an instructional video, the copyright holders will go after you.
The Jews own all the media outlets and control the judiciary and the police. That's why.