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Is the Android Protonmail app on F-Droid safe?
(android.izzysoft.de)
There is now an official Protonmail Community at !protonprivacy@lemmy.world
Honestly I don't know, but this is the reason that I passed on the Proton when I wanted go for paid tier and I decided to go with Tutanota instead, as they have all components of their apps open source, as far as I am aware.
There's the one con that they don't allow to use any 3rd party email apps, but from what I have heard, ProtonMail Bridge is also not that great of a solution.