@fdroidorg We are very proud having published the Tutanota app on F-Droid years ago so that you can now use it without any connection to Google! (Read more about this here: https://f-droid.org/2018/09/03/replacing-gcm-in-tutanota.html )
We absolutely love this project so do consider donating. 🥰♥️👏
"The Tutanota apps are Libre software, and we wanted to publish our Android app on F-Droid. We wanted our users to be able to use Tutanota on every ROM and every device, without the control of a third-party like Google. We decided to take on the challenge and to build our own push notification service."
"Wouldn’t it be great if the user could just pick a “push notifications provider” in the phone settings and OS managed all these hard details by itself? So every app, which doesn’t want to be policed by the platform owner, didn’t have to invent the system anew? It could be end-to-end encrypted between the app and the app server. There’s no real technical difficulty ... but as long as our systems are controlled by big players who do not allow this, we have to solve it by ourselves."
Reading the blog post you linked above, I am curious if there is a reason you didn't use Unified Push? It allows users to pick their push provider, saves battery life because less apps need to have persistent connections to servers, and keeps each app developer from needing to custom implment push notifactons. Not that there is a problem with what you did.
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