
How many people actually use Google Play Books?
I noticed recently that the Google Play Store lists GPB as having over 1 billion downloads. I would assume that number comes from it coming pre installed on a majority of Android phones, tablets etc (maybe Chromebooks)?
It made me wonder how many people actually use it regularly. The only proxy for this I can think of if Google doesn't release stats is the number of reviews of books.
I had a look at the main chart on my front page and the largest number of reviews I can find for a single book is 12. I also looked for for Project Hail Mary, a popular book with a movie out currently and that has only 1000 reviews.
Does anyone have any other ideas on how to understand GPB actual user base?
Thanks :)