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Play Services does handles all push notifications. The 'some reason' is battery life, because your phone shouldn't maintain 30 long lived connections. From the

by dannyw 7y ago

Play Services does handles all push notifications. The 'some reason' is battery life, because your phone shouldn't maintain 30 long lived connections. From the privacy aspect, I believe all notifications are end to end encrypted actually. Same as Apple.

roywiggins 7y ago
Sure, but there's no way to unbundle the very useful notifications service with... everything else. It's not the notifications service that's the problem, it's everything else you're required to run if you want it.
- jraph 7y ago
  For this you may use microG. I have it installed for geolocation using Wi-Fi and cellular antennas but never tried to enable the notification service. I would actually be interested in being able to choose the server used for this service, and would enable it without hesitation if I could use my own server for instance.
HenryBemis 7y ago
Encrypted, but that's on transit. Does Google read everything, or the only thing transfered is the alert and NOT the Signal/text/WhatsApp message itself?
- dannyw 7y ago
  End to end encrypted to device, standard pub/private key crypto.
- smush 7y ago
  Signal is e2ee so Google Cloud Messaging should only get the alert itself, then the encrypted message is downloaded from the server and decoded on device.