If you run a Zulip server, you can have it send mobile notifications without needing to compile the mobile apps yourself. Lots of people do that, though their motivations may be different from the grandparent's.
This does mean sending the notifications through a central notification "bouncer" service which we run, and that page of our docs explains why the way Google and Apple have designed their push-notification systems makes this necessary.
We're working on end-to-end encryption of the push notifications:
https://github.com/zulip/zulip/issues/6954
Once that's done, that will mean that the content can't be read by the bouncer service, nor by Google or Apple en route.
If you run a Zulip server, you can have it send mobile notifications without needing to compile the mobile apps yourself. Lots of people do that, though their motivations may be different from the grandparent's.
This does mean sending the notifications through a central notification "bouncer" service which we run, and that page of our docs explains why the way Google and Apple have designed their push-notification systems makes this necessary.
We're working on end-to-end encryption of the push notifications: https://github.com/zulip/zulip/issues/6954 Once that's done, that will mean that the content can't be read by the bouncer service, nor by Google or Apple en route.