If people can't make money without the government enforcing artificial scarcity of their output, they can always chose another business model.
Okay, but this literally goes for every single good ever. Case in point: theft. If theft wasn't "arbitrarily" made illegal, then there exists no business models for anything, ever. Because you could just steal it for free.
The idea behind IP is that IP is a good but an ephemeral one, one without a physical manifestation. So, we need to translate a type of theft that works for that.
Or, we could not. But keep in mind IP doesn't just mean music. It means, like... everything that isn't physical. Including my job, and probably your job too.
Imagine I put up a ghetto blaster and a hat. I play the finest music ever made. Would you put money in the hat? Would the idea to put money in the hat ever cross your mind? Would one even understand they want you to put money in the hat for playing the music?
For books, most of the ones I read are passion projects and if I like them I buy them as thanks to the author/publisher.
I also have absolutely no problem with paying people for their work, I just do not believe they have any rights to their so called "IP".
Even corporate funded researchers, e.g. for AI, will publish and most of the published results are not protected by patents. Everyone is free to implement someone else's research paper and use it for their own commercial application. Science is also gravitating more to open access, e.g. with arxiv for mathematics and CS. Nobody owns "the right" to some mathematical proof or concept.
Citation is of course encouraged, but plagiarism is not a legal matter, much less a criminal matter.
