It's more of a large-scale broadcast situation. Think of large corporate town halls, town council meetings, etc.
Giving all the data to zoom probably means also giving it to most US law enforcement agencies (should they request it), that would be a big no no for me.
Oh, and you can also do sub-rooms with Zoom, which has some applications in these types of meetings.
If something they said in the main presentation was missing important details that you need to do you work, why do you need to wait days/weeks for them to gather all the questions, find all the answers, and publish a video, when they could just answer it live in a few seconds?!
"At that scale there'll be no interactivity during the meeting anyway."