@andreas oh nice it has DRM…
“Please note that even though they may be compiled and modified freely, the Threema apps are still paid apps. An anonymous license check prevents the creation of Threema IDs on self-compiled apps. If you would like to use a self-compiled app, please restore the backup of an existing Threema ID. You can create Threema IDs and backups thereof using the purchased app.”
This app can go slurp a big one.
Personal instance of nitrohorse (nitrohorse.com).