Earlier quoted context omitted.
The more successful "self published" authors writing web novels make significant money from patreon (>$20k/month); this relies on copyright protection (but interestingly, just a few months would be sufficient for that business model).
In what way does that business model rely on copyright protection? "Get the next chapter early" requires a source of chapters, so all you need is for paying clients to not be motivated to redistribute the chapters in an organised way, or would-be paying clients to not be motivated to use such organised "slightly more chapters of that webnovel you follow" services instead . Humans aren't amoral ideal rational economic…
This is exactly what copyright is.
I agree that you could work around this in a world without copyright (e.g. by watermarking content and blacklisting), but it would be difficult and make the whole profession less viable.
Mass distribution and payment becoming accessible/low overhead was an extremely helpful development for authors in my view, and removing copyright would have the opposite effect (but cutting it down even to several years would change surprisingly little).