In youtube there are people who takes ownership of songs that do have copyright owner but the owner don't give crap of people using their music (example, an intro song for a 80s cartoon).

The thing, is as long as those people have the ownership, they can demonetise your video and take it down, but you cant remove their claim of ownership unless you are the legal owner of the copyright, who as I said, does not care about it...

So whatever system you get, it is not perfect...