I made some pretty bad quality games, published them on Google Play, also meme YouTube videos, put ads in them and after 5 years I was able to pay out whole $100.
Spent 9 years building a JavaScript library, earned about 4490 USD in total from it. Then spent 23900 USD in manufacturing a single product (quantity of 1, ran out of budget) for which I have no known client for. Built an iPhone app and made maybe 300 USD for that. Yeah business is hard.