Analogies are dangerous, but perhaps one will help here.

The book on Google Docs is similar to someone's cocaine falling out of their pocket and hiding in your couch cushions. You didn't know it was there, and when your partner finds it, you flush it.

The book being printed by Amazon is you finding the bag of coke, cutting it and selling it, splitting the take with your friend.

I'll note that "benefit from" is a construction that can do a huge amount of work. I have "benefited from" some truly horrific historic crimes, despite having nothing to do with them (or even having been born yet). I bet you have, too.

Using less attenuated language that makes clear what's going on is a lot more convincing. It also tends to expose differences, like what is going on here.