Hi @SzczepanOfAnimorph ! Yes, I sent a short inquiry message to https://collocall.de/ and I also briefly checked how easy it would be to install BBB in NixOS 
and Oh Man, it looked complicated! (NixOS package for BBB is currently work-in-progress)
I have sounded out the idea to a few of my friends in Japan and I see a great potential for worker cooperatives, NPOs, etc. They want to avoid Zoom if possible.
My cell phone is +81 90 6523 2640 and Iām on the usual proprietary suspects including Signal/Telegram/Skype/Iphone (FaceTime)/etc I would love to discuss further with anyone interested!!