this post was submitted on 05 May 2025
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Its one or the other. Either Google Play Services will push notifications, or the apps have to have the ability to handle push notifications on their own (which isn't common).
Google Play Services can be sandboxed in GrapheneOS, but there isn't an open source Google Play Services since its not included in AOSP. It is very much a proprietary blob.
microG is an open source, reverse engineered replacement for Google Play Services on Android. It still connects to Google servers, though.
GrapheneOS doesn't use it because they came up with an effective Sandboxing solution, and microG requires spoofing the signature to make applications believe that the service was signed by Google, which introduces a potential attack vector.