I'd use this if it had a book I wanted to read. A while back, I tried Prismatext (https://prismatext.com/). It only offered old classics that had come out of copyright (ie, Project Gutenberg) and a handful of poorly-reviewed modern novels.

If you can license a modern book that someone would actually choose to read on their own, I'd pay for it. Bonus if I can sort/browse the available books by Goodreads (or similar) score. Prismatext makes it tedious to discover that readers didn't care for their modern books.