Hi @mehdi, I was influenced by three of the developer's blog posts:
a) here, he explains his motivation for developing an audio-only-SFU based on Pion (i.e. Kraken) after having examined Janus, Jitsi, Mediasoup; and why he abandoned the mornin.fm approach
b) here he spells out how he used Kraken to roll out the E2EE group audio call feature (using Signal Protocol + Chrome's WebRTC Insertable Streams) in his Open Source Mixin Messenger
c) and finally, here, where he explains how to deploy the Kraken Group Audio Conferencing Service and points out that "A self hosted group audio conferencing service will provide good privacy because the data never leaves your servers, and you will get more excellent performance compared to shared services like Zoom, since you could choose the servers near the participants, and make use of all the system resources and bandwidth."
Therefore, I felt that Kraken.fm (even if it is not E2EE) would make a fast, private audio conferencing service for the community on my Cloudron (eg. for large 75+ person townhalls).
I already run a large, separate Jitsi server - and that is where these private, community audio-events are held today - but this seems to be a more elegant solution!
Finally, it uses the same stack as peercalls.com ...which is why I had put it on that thread.