There’s a nonprofit that wants to do several meetings for lectures for about 3000 students. The presenter will show screen or share a document for the most part. At the end students would raise hand and have some discussion, so they will be just viewers for most of meeting
Of course, big corps like teams and google meeting won’t Handel this much, not for free at least.
Could I suggest jitsi to them? Can it Handel this much? How much is it going to cost?
If you try to use Matrix for a call with 3000 people you are seriously going to piss off the sysadmin of whatever instance you are on, and those 3000 people are going to end up being permanently banned.