How did you get your app to take off? I built a music app and it was just insufferable trying to get users that didn't uninstall the app 1 hour later. It was disappointing to because personally I thought the UI was really nice.

Got in the game super early (nearly 5 years ago) when the space wasn't nearly as saturated. That and getting really lucky with ASO

Where did you learn ASO? Is there a noob 101 guide somewhere online?

Trial and error. I didn't really read anything but instead just tried to put myself in the shoes of a customer. It came down to me realizing that the features and info that I felt were important as developer were possibly not so important for a user.

Amazing! All revenue is from ads? Do you use networks or do you have direct ad partners?

Yeah! Entirely ads mediated through MoPub and some other partners. Since the user base is strongly recurring users, ads perform very well