Relevant text:
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My synagogue uses zoom and I’m afraid of the potential risk this might place them with now
for meeting and other video conferencing needs: https://jitsi.org/jitsi-meet/ , not hard to set up and get going.
and of course just video chat with no back end there is always https://vdo.ninja/ though I strongly recommend rolling up a jitsi-meet server
for streaming https://obsproject.com/
Zoom could easily be replaced at little cost other than someone’s time and a donated fairly modern computer (note: businesses can often deduct the full value of the computer if it is two years or less old and is donated to a qualifying organization, such as a Synagogue).