Profitable? None. For fun? Well, I made a stupid app for myself (showing all routes I’ve walked through in my city, that gets data from HealthKit), got pressured by friends to share my walking progress in a local subreddit which went semi viral, and people started asking what app I was using.
I had absolutely zero intentions to market it, but seems like there was a niche need as other apps weren’t making it simple for the feature I was looking for. Gives you dopamine hits when you can see others using the app, especially when you know you’re doing it just for fun and no money is involved.