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The issue lies with Google's FCM (Firebase Cloud Messaging) system, so it's not something GrapheneOS can really fix. As far as I know FCM doesn't offer a way to encrypt notification content. Some apps like Signal work around this by instead of sending the message content, they send a little "wake up" notification. This tells Signal on your phone to wake up and it goes and retrieves the new message.
If you don't install Google Play Services, you won't be impacted. But you'll also not get notifications for most applications. There is an alternative push notification system called UnifiedPush which allows you to choose any server to handle your notifications (and even self host it). But it does require both the service and the app to support it, so it's not very wide spread yet.
If I were to install MicroG in a different profile would the rest of my push notifications be compromised too?
Lol, FCM sends the CONTENT of messages through Google?? Wtf why do we even have "E2EE" Whatsapp then?
Firebase is a platform/service provided by Google, so it makes sense that the content goes thru Google's servers.
Also, E2EE in a closed-source app like WhatsApp, run by a nefarious corporation like Meta, was always a joke concept, a marketing ploy at best. People who are truly concerned about their privacy would never touch WhatsApp.
I've never worked directly with FCM, but that's my understanding of the issue. I don't know about WhatsApp. But it may do the same thing as Signal where the notification is just a wake up call and then the app connects directly to the WhatsApp servers to get the actual message.
Why do we need a server to handle notifications anyway? Why isn't it local to the device?
It's mostly a power efficiency thing. Before push notifications were the norm, most apps used a polling method. They had the application send a request every X seconds asking "anything new". There wasn't coordination between apps, so even every app checked once every 30s, it likely wouldn't be on the same 30s. This caused the device to wake up a lot and never let it switch into low power mode.
A push notifications system like FCM or UnifiedPush means only a single application needs to run in the background. It maintains a persistent connection to the push notification service and waits for a message. When it receives one it wakes up the relevant app and passes it the details.