[drakonka]

There are many serial services like this, and Amazon recently launched its own with Vella.

This can be a valid model, but in my opinion it would be unfortunate if it totally replaced the model of publishing the entire book at once. These kinds of episodic projects usually require installments that end on some kind of cliffhanger; something to keep readers going to (and paying for) the next installment. While there needs to be a certain amount of this in a book that is published in its entirety as well, the short-episode serial format morphs what the final result looks like to a much greater extent, and not always for the better imo. The goal to meet that market's demand is no longer to produce a complete standalone work, but to drag out the reader's attention for as long as possible episode by episode.