oh, das ist ja auch mal ne Interessante Info.
Alternativen?
About Jitsi Meet | Free Video Conferencing Solutions
What is Jitsi Meet? Jitsi Meet offers free, secure and open-source video conferencing. Start using Jitsi Meet today, and deploy videoconferencing solutions.
jitsi.org
BigBlueButton | Open Source Virtual Classroom Software
BigBlueButton is a global teaching platform. This open source virtual classroom software was developed in a school, not in a boardroom. Try it now.
bigbluebutton.org
Talk - Nextcloud
nextcloud.com
Das sind Empfehlungen von Digitalcourage. Vom Rest würde ich die Finger lassen.