To your point, the vast majority of media and software is proprietary, though much of it is supporting in nature and not directly for sale. Nevertheless, shouldn’t publishers be free to choose how they fund their creations?
If we take away the option of artificial scarcity then an entire highly trained professional class will be out of work. While I don’t think Jonny Depp, for example, is worth $650M [1], I don’t personally think that’s a great option for the editors, writers, extras, gaffers, and many other professionals that work together to make great media.
Companies are motivated to maximise the revenue from making this stuff. If they could make more money without copyright, they would have done this already. (And radio is a terrible example: commercial radio simply plays advertising for artists, called “songs”, 24x7)
[0] https://en.wikipedia.org/wiki/List_of_most_expensive_films
[1] https://www.theguardian.com/film/2020/jul/13/johnny-depp-tel...