Sometimes I wonder why anyone would want to own stake in and entertainment based attention economy like thing when they have no use for entertainment, or can't understand that approach of mine. I don't hold it against them though.
I think we should have the option to select which communities our post will show up in, before we hit the 'post' button. Then all the cross posting stuff could be used for examples like you've given, plus probably a few more good ones.
If consumers want to do all the cross posting, then I don't need to decide where to place my work. They can do it and be rewarded for it. For instance, as a content producer, I don't know about that community for horror stories. If it exists but I don't know, how would I know to place it there if I write a horror? There will be thousands of these communities. You can't expect me to select hundreds of places and cross post into each one. That would be absurd and counter productive.