So it looks like @protonprivacy made their Proton Mail app proprietary – or do I miss something? On the PlayStore there's a v4.0.6, while the Github repo at https://github.com/ProtonMail/proton-mail-android didn't see any commit since last October, and has v3.0.17 as latest release.

I hope I'm wrong here and just missed a note that you moved the repo to e.g. Codeberg or so?

GitHub - ProtonMail/proton-mail-android: Proton Mail Android app

Proton Mail Android app. Contribute to ProtonMail/proton-mail-android development by creating an account on GitHub.

GitHub

It does look like Proton has gone back on its promise to make its Android app for Proton Mail open source.

@protonprivacy Looking forward to your response.