One important thing though: many many people globally can’t afford to spend 6 USD on a secure messenger. They take what is the cheapest or free.
Discussion
Threema
central, non free, costs
positive: open source app with documentation
positive: functioning and transparent business model
positive: no cryptocurrency or online payment systems planned!
positive: multi-device capable
positive: independent of phone number as identifier
positive: customized version “Threema Libre“ for Android does not require proprietary software library from Google or other third parties
unclear: tracker in Android app “Threma” (as payment versions cannot be checked by Exodus). But no trackers detectable in Android app “Threma work” (36 permissions): Exodus (external)
positive: according to webbkoll (external) no third-party cookies and no third-party requests (third-party)
negative: central service (= dependency)
negative: no interoperability resp. no interface to chat standard XMPP
negative: server code is not open source
negative: no native desktop app
Whoever pays the musicians also determines what is played.
Threema takes a few coins once and is therefore ONLY and EXCLUSIVELY committed to its users.
You can see who is behind the other messengers above. And they will already collect your data.
Threema collects nothing!
Threema already has to co-operate with the authorities, but at the latest when the EU chat control comes, nobody will believe these marketing promises anymore.
Everybody can read about that in their transparency report on their website
https://threema.ch/en/transparencyreport
And they give out 2 Informations about a Threema-ID:
1. Date (without time) of the Threema ID’s creation
2. Date (without time) of Threema ID’s most recent login
These are the ONLY 2 Information they store!
The following information is only available if the user has chosen to use the respective optional functionality:
Only in case the user in question has chosen to link a phone number and/or email address with their Threema ID: Hash of the user’s phone number and/or email address
Only in case the user in question has chosen to use a third-party push service (and their ID was active within the last three months): Push token
So what....