This is getting pretty off topic so I will hide my reply here
It’s pretty clear to me that linux users are second class citizens in the eyes of Proton. The Proton Mail app for linux was released well after Windows and MacOS, and even now is in beta while the others have had a full release. It also didn’t even have proper Wayland support last time I checked, making text blurry with fractional scaling enabled. Proton doesn’t use packaging distribution methods that are standard in the linux world, instead requiring people to download the files directly from their website. There are flatpaks available, but last time I checked they were all unofficial and unverified by Proton (which is also a security risk that they have failed to address). I see posts like this all the time on this forum:
Proton on Linux (to community)
Proton VPN brings split tunneling to Linux – here's what you need to know
Proton Mail doesn’t even have notifications on degoogled android unless you download a third party app. This has been an issue for years now and is absolutely unacceptable in my view.
Downloading an APK manually is not user friendly and is not the preferred method of installation for most people. I don’t believe the app has an auto-updater either which is bad for security.
I also neglected to mention in my previous comment that Proton is terrible at open source development. I used to use Obtainium to update Proton Mail for Android and it was a disaster because the Github code was never up to date with the newest Google Play release (there are posts around the internet about this as well). I see posts here about these types of practices all the time:
To me, it seems more like a pattern of behavior that represents a misalignment with my ideals and likely the ideals of many on this forum as well.