Why are you using the demo server then?
Of course a free open-source project that doesn't sell away your privacy or tries to defraud you (aka advertisement) can't suddenly scale up a thousandfold!
Because: How much money did you pay exactly?
If you're in a business, install jitsi-meet on your server, and be done with it. Get an actual private experience for free. What kind of show are you running that you don't have an admin for that?
I didn't say I was using their demo server. It was running on AWS (Amazon EC2) with the latest version of Jitsi and with more than sufficient resources allocated, and the guy administering it has 30 year's experience of server administration. When there were issues he was asked to check the server status and there were no problems, it was just a software issue. I don't know why the choice of server would make the mobile app crash and close unexpectedly and the call quality vary so much. Often video was fine but the audio just cut out completely and all we could see was the participant's mouth moving. Other times the video would be flakey and the audio fine. It was on a data centre in the same country as all the recipients.
Beware of all enterprises that require new clothes, and not rather a new wearer of clothes. -- Henry David Thoreau