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> On Android I think most apps still prefer to keep their own background connection open

Many Android apps give the option of using either FCM (Firebase Cloud Messaging, Google's push service), UnifiedPush or polling.

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Of note, Conversations and some other XMPP clients can act as UnifiedPush Distributors (i.e. they use their own reliable persistent connection to proxy notifications for other apps). Some mastodon (tusky, fedilab, …), matrix (fluffy chat, element x, …) clients use it¹

¹: https://unifiedpush.org/users/apps/

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