This is my 2 cents, I don't think I'm right or wrong. Just my opinion:
If Proton were to either take the AOSP and add proton features to it like their mail, calendar, drive, etc etc, add something like F-Droid for the app the store, or partner up with someone like LineageOS who'd do most of the heavy lifting on that side. Also I didn't know this, but based on the comment below, remove the Google Play Services reliance for notifications. This would be a monumental thing to do, and I do not expect them to do this as much as I can hope. But if they did, well i might have to find a phone that is easy to swap the OS out on just for this.
This is my 2 cents, I don't think I'm right or wrong. Just my opinion:
If Proton were to either take the AOSP and add proton features to it like their mail, calendar, drive, etc etc, add something like F-Droid for the app the store, or partner up with someone like LineageOS who'd do most of the heavy lifting on that side. Also I didn't know this, but based on the comment below, remove the Google Play Services reliance for notifications. This would be a monumental thing to do, and I do not expect them to do this as much as I can hope. But if they did, well i might have to find a phone that is easy to swap the OS out on just for this.