The meeting itself
Jitsi Meet
The engineering is real and published: a selective forwarding unit shown distributing over a thousand streams on a single quad-core server, desktop sharing, and a Last-N mode that protects constrained connections. But we found no public information on breakout rooms, waiting rooms or per-participant moderation, and the vendor states that on the public instance all users are moderators — a room where everyone holds every button is a room nobody controls.
Nextcloud Talk
Breakout rooms and a webinar lobby exist, and scale is honestly published — 6-10 participants for a private setup, thousands per call at enterprise. But the evidence says nothing at all about screen sharing, mute-all or other moderation controls, or adaptive behaviour beyond the candid note that a private setup only reaches 20 people 'if all participants have a good network connection' — silence is information, so I sit at the anchor, not above it.