I was in a public zoom meeting just now, with 100+ participants. Unfortunately, it was "zoom-bombed", where a prankster started sharing porn, played hateful audio and annotated the screen with obscene drawings. This went on for almost 40 minutes, and it was hard to figure out who the miscreant was. RI meeting links are privately shared on this group, but I would still recommend taking some measure to prevent this from happening to us. Perhaps password-protect them? Or only allow emails of those signed up to RI?