All of this is anything but clear-cut. However, I think that in a no-IP world, producing 'commercial' movies as we now know them would be far trickier.
Of course copyright does not 'guarantee' profit: you can make a shitty movie and lose money. However it provides some protection for content producers and indicates a fairly clear path to making money: make something and sell it.
Of course copyright does not 'guarantee' profit: you can make a shitty movie and lose money. However it provides some protection for content producers and indicates a fairly clear path to making money: make something and sell it.