I imagine it is very hard to make money with the types of apps that fall within those most popular app categories. Mostly free apps with advertising. I guess I

I imagine it is very hard to make money with the types of apps that fall within those most popular app categories. Mostly free apps with advertising. I guess I don't really understand the shift of ONLY creating a mobile app for productivity or business type stuff. Seems like these types of apps can more easily be monetized with a web app and "maybe" complimented with a mobile app.