I've only been able to acquire 6 users since releasing it (°ー°〃) I tried promoting it here (duuh), Reddit, and LinkedIn. Optimized it for SEO (ranking 3rd on my target keywords). All with limited success.
So I've decided to open-source it! Links to... - frontend: https://github.com/mihailthebuilder/hackernewsalerts-fronten... - backend: https://github.com/mihailthebuilder/hackernewsalerts-backend
I'm still using it for myself, since there's no service that sends alerts when you get a new comment in one of your posts. But I won't invest any more time in it.
Welcome any questions/comments!