alt Hacker NewsThis isn't true, self-hosted Android push notifications in ntfy are provided using a "foreground service" by default (i.e: the app keeps a websocket open and listens), unless you set up firebase for yourself and build a custom version of the app with the cert baked in.
So it either drains battery and gets significant delays (as per ntfy's own docs), or it still uses Google's solution. There is no free lunch.