Sorry, this gets out of controll. How are we supposed to answer to all of the side issues? Self-Publishing is a HUGE topic on itself. Amazon is the biggest player there, shure. But they gave good conditions and created a big market. But they don't own ANY of the rights. The authors do. That's the point about self publishing.
Should we really talk about tv production? How do you think HBO creates its shows? Or Hollywood movies? It is another HUGE topic in itself. And even if you look at something like the "curated" european movie and tv production, that system has as many flaws as the open market (maybe even more).
Where did you get the idea, that kindle unlimited is a library or even works/ should work like one? It is a business model, like music streaming. And it has to make money. For amazon and for the authors, because if it doesn't work for authors, nobody would give books into it.
Funny enough, but Bertelsmann became big because they had the "Bertelsmann Klub", where you spend some money to become a member and then you had to buy a book a month to very good conditions