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 rea

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.