Creative works is arguably all just "remixing" what already exists. ... In which case nobody alive truly owns anything which isn't just a derative work of what

Creative works is arguably all just "remixing" what already exists. ... In which case nobody alive truly owns anything which isn't just a derative work of what the estate of some ancient Greek's estate would already own, thus you'd owe them royalties for everything you do with "your own" works. It is also by nature non-rivalrous, this no need for defending it to be able to use it for yourself. It is proven over and over that sharing and collaborating results in better outcomes for everybody, and thus there's no strong argument based on "benefit of the author" in favor of it. There's also no obvious definition of what the limit is for WHEN you've created something novel, thus nobody can ever actually really know if they truly have something they actually own or not.