Earlier quoted context omitted.
My ten year old uses "Libby" a lot to borrow books from the local library - at one point they started rate limiting him. He also typically has a dozen physical books checked out at any given time.
Just curious: What kind of books do they read? On an ipad or something?
I also occasionally let him have a little bit of Libby or scratch time (which I deem "educational") before going to school or before bed. (Everything is contingent on behavior.)
Aside from minecraft/pokemon stuff, he typically reads a mix of kids graphic novels and books. Including Tristan Strong, Artimis Fowl, Wings of Fire, Dogman. He's also read Harry Potter, some Terry Pratchett, and Tolkien. He first read the Lord of the Rings in the summer between first and second grade, which blew my mind (it was middle or high school or me). So I don't really worry about stuff like the ratio of graphic novels to textual books.