alt Hacker NewsI'm asking because I hate Matrix and actually want you to convince me: why should I accept the risk of migrating my friend group from Discord to Zulip, which has already "broken the seal" of restricting features behind a monthly fee even for self-hosted users, when I could migrate us to Matrix instead? Matrix seems like the much less risky option.
I see that you have a "community" tier that's free and doesn't restrict notifications, but it's not clear to me exactly what's involved in proving that we should qualify.
Mobile push notifications are a special case because it's literally not technically possible to self-host them. Or rather, it's possible if you build the iOS and Android apps from source and distribute them through TestFlight or an analogous Android channel, but it's not possible for the developer of an App Store or Play Store app to allow its users to point it at a different push-notification server, because the public key has to be hardcoded in the app binary. So if you want your self-hosted Zulip server to work with the Zulip client apps in the App Store and Play Store, you have to use Zulip's push server, and there's nothing Zulip can do to fix that.
Matrix works analogously; if you use the Element app from the App Store or Play Store, then you're using Element's push notification server, even if your Matrix homeserver is self-hosted. It's possible that Element allows their server to be used gratis in situations where Zulip charges a fee, I don't know their policies or anything, but in principle Matrix still leaves you exactly as dependent on a third party's goodwill unless you make your friends install a privately distributed mobile app.
Zulip IIUC does not restrict self-hosting of any feature that's technically possible to self-host.