Hi! ntfy [0] maintainer here. Happy to answer questions about it :-D Also: You linked the wrong HN thread. Here's the correct one [1].

[0] https://ntfy.sh / https://github.com/binwiederhier/ntfy

[1] https://news.ycombinator.com/item?id=29715464

I self-host and use ntfy for several use cases on top of just notifications (which it does really well and without fail). I built a clipboard sync tool that uses ntfy as the backend, and use it to control Tasker on my phone from Node Red (things like going into "night mode" when there's no motion in the living areas of my house after a certain time).

Used Gotify for this for a while but ntfy's topics makes separting functionality easier and ntfy supports UnifiedPush without any additional proxy rules.