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A comment on Apple gave me the Hey treatment back in 2014. Parent comment

Re:Apple gave me the Hey treatment back in 2014 by Andrew_nenakhov on Friday June 19, 2020 @03:13AM (#23571888)
Oh come on. Push notifications is just a modified XMPP connection that exists in the background. Actually, both FCM and APNS use XMPP to transport notification to devices.

The only 'special treatment' that happens is on Google/Apple servers which determine the priority of some of notifications.

How do I know? We're very involved with the XMPP protocol. The irony is that it is insanely hard to maintain an XMPP connection to a client on both Android / iOS, despite devices under both these OSs being an always connected XMPP clients.

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Re:Apple gave me the Hey treatment back in 2014 by namibj on Friday June 19, 2020 @04:30AM (#23572354)
Well, in your sibling I have linked a paper that talks about the negative effects of un-coordinated persistent TCP connections on the network's stability. I read a god chunk of it, and it seems to explain quite well why these push services get special treatment. Hint: it's connected to them running a keep-alive delay in the "hours" range for the mobile radio link, without imposing that on the cloud server.
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