Readers do not need to pay. What I mean is that they will only pay when they want to be the owner of a valuable phrase, story, or content. Then that person can sell it. Ownership means that the post will be on your social profile.
Yes, that's true, because before the buyer doesn't want to own it, then he can only see things like collections of goods in the marketplace or like E-Commerce.
So it's also almost the same as the others although the way it starts is a little different from people selling other items
From my view content is not something that sellable, if it already published it becomes the public ownership. It could be make money if you are hiring someone to make you a content, or the content itself is promoting a product that will be sold on also on the public, the money is coming from there.
But if you are on several platform like youtube, you could register your license to your content so it will be not able to steal.