On the other hand though, say you’ve been writing a web novel that could be sliced up into 3 separate books or you just have 3 books that’s only now getting released. You could release them over time or you could choose to have all 3 go up at once. Not to mention as a first act of defense, it’s a reasonable action to make and is easily adjustable later on.
There’s probably other reasons why someone would release more than one book at once that’s completely understandable, especially when considering what technically counts as a “book” such as translations or a company publishing titles of multiple authors under one name,