I've long believed that all apps (at least on Android) should start supporting UnifiedPush[1]. Tools like ntfy could serve as a central hub for notification distribution, allowing anyone to have their own notification server to connect apps and mobile devices. This would ensure greater privacy.
This is also why I developed NotiMail: we shouldn't have to rely on the 'big players' for our notifications and data.

[1] unifiedpush.org/

#UnifiedPush #AndroidApps #PrivacyMatters #NotiMail #Google #Apple #Android #iOS