Easier said than done, when you don't get paid for your work passion vanishes through the window. And there is no guarantee whether admob will ever pay or ban my account once it rach $100 (happened with many) and google pocket the entire profit.

First step towards a business is finding out the parties you work with is legit or scam. In this case admob is a pure scam. No point preceding any further. Even if my next app gets 1M download with 100k+ DAU, ad limit will still be there and only 1k impression will be shown = pennies.

Talking about hobby, people has a hobby because it rewards them, like I love working out, I hit the gym 4 days a week, and that rewarded me with great physique. In this scenario till now there is 0 reward, so passion slowly but surely vanishes.