https://play.google.com/store/apps/details?id=com.yocto.weno...
Here's my take :-
1) Just like in other businesses, it is a competitive market.
2) However, it is also full of limitless opportunities. Google Play store helps you to reach worldwide end consumers. Only a few channels can do that with a frictionless payment system. Google Play store is one of them.
3) Since it is a highly competitive market, you need to know your niche and know who your targetted customers are very well. Then, we provide a solid solution to fit customer needs.
4) Play store tax is not a concern. Once you publish the app, the only main concern is how to market the app and how to pitch the app so that consumers will choose your app over the others.
5) With some luck, one will hit overnight success. But, the chance is rare. Most of the time, we need to invest a lot of resources, and success is not guaranteed.