Ask HN: What's a side project you built to make money that hasn't?
Okay I made halfchess.com . I recently made an update to improve monetisation and next day day I saw I had purchases of $16 on google analytics. I was quite thrilled and thought its only going to go up from here. Until I checked google play console to realise that there had been no purchases. It was me who was testing some new payment buttons and generating fake purchase analytics events. My learning from the experience is, it feels great to see your app making a few dollars the first day it does so.