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Sometimes, and the good times, it's not about reveunes, it's about the user base, at some point you are going to earn money, but you choose when and how, for example Instagram, reach100M users without even add a small ad banner to monetize, but he was looking for a user base, he was looking for the number of users because most of online business is about users, if you have users you can have anything else, then Instagram ended it up with1 Billion acquisition from Facebook, just because of the100M users
Simply because, not every app needs to be a businesses. Its created to fulfill a need and the makers build it to play a part in solving a problem.
Then there are other developers who will literally say, we used open source free tools to develop so what charge people.
Furthermore advertising ruins apps, there are other innovative ways to go about making money off an app, but that is just my opinion.