I know the guy who made the unofficial Tesla app. He's doing very well now. Personally, I had an app that was on its way to allowing me to transition to focusi

I know the guy who made the unofficial Tesla app. He's doing very well now. Personally, I had an app that was on its way to allowing me to transition to focusing on mobile app development full time. But it turns out you need a license to perform money transference, which was what my app was... and luckily Google shut me down before I got into high volume and any legal trouble. To your point: my second app was a super expensive (for me) colossal failure. I know another guy who nets about $200k USD making puzzle apps, though that also includes web apps started in the mid 2000s.