I started basically when I stumbled upon a problem myself. https://thehorcrux.com/why-i-built-horcrux-app/ TL;DR: Google disabled my account. So, built an email backup app to not get into this situation again.

I started building the app 4 years ago. I put it on Hacker News and it blew up a tiny bit. That was enough to keep it going until now.

There is still a lot of work I can put into it marketing or coding wise. So far, it's been going well ($800ish). I recently rolled out a UI/UX improvement.

Its 4 year anniversary is in 2 days. :)