Lol. Yeah it’s all fresh or properly sourced material.
Go search for any music video. You should be finding exactly one (1) official entry. In some cases there are legit live recordings + montage that should also be only one of.
Instead there are dozens or hundreds, and most of them are not transformative enough to qualify for fair use. Google knows which ones are there illegaly because they are clearly able to identify and demonetize them.
But why not straight out delete them, or tell the uploader to delete them or else? Because they want to have lots of content regardless if it’s legit, and they want to show ads, just as long as it goes to the right people.
They can put ads on questionable content that’s free to watch as long as they’re ready to remove it if and when asked, but they can’t sell a product based on questionable content. It comes too close to what piracy websites are doing.