Threema is now free software AGPL?

[Ade Malsasa Akbar]

Hello, Free Software Community. Today, I got a surprising news from 
Threema saying "Threema is now open source" [sic][1][2]. They say 
further "[...] Threema apps’ source code is publicly accessible starting 
today. It is subject to the AGPLv3 license [...]". I am happy with this. 
As far as I know, Threema is praised and recommended as secure messenger 
(although is/was a proprietary software) 2nd place between the free 
software Signal and Wire by a security review site[3]. But I want to 
know what is your opinion and what is FSF's stance on this news. Thank 
you very much.

With respects,

Ade

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[1] https://threema.ch/en/blog/posts/open-source-discount

[2] 
https://web.archive.org/web/20201221083018/https://threema.ch/en/blog/posts/open-source-discount 
(archived)

[3] https://www.securemessagingapps.com/about