Indeed, this is very much a limitation for all apps on iOS that don't want to rely on centralised services, such as a push notification server other than Apple'

Indeed, this is very much a limitation for all apps on iOS that don't want to rely on centralised services, such as a push notification server other than Apple's. See also: https://developer.apple.com/forums/thread/685525 https://developer.apple.com/forums/thread/685525