So many replies here have identified the value of Zoom: it is easy to use and has reasonably good quality. So the questions I have: can we add to this? Are there ways to use Zoom more privately?

Personally I haven't seen many people offer up alternatives that are clear winners. They all have tradeoffs. Since there's tradeoffs I have a hard time moving people to some other direction. If I could says, "Oh Zoom is nice, but Schmooz is the best!" I know people who'd make the move. Even if it's paid.