I assume that Zoom's rivals have been desperate to dish the dirt on the security issues, given that Zoom is wiping their faces in the dirt. Or am I too cynical to be a Reg reader? Zoom seems to be very balanced geo-politically - Accused of leaking to both China and Facebook at the same time. I don't defend that, hence the penguin. But Skype and WebEx have had security issues in the past too. It seems to be Zoom's general website, not the comms system, that leaks to Facebook. That's no different from every other company I deal with selling my data to large US Corps.
Five of us tried Zoom, Skype, WebEx - Zoom had the best interface and features. Surprisingly it had the best call quality too. Perhaps Chinese servers are better than US ones? Of course small scale, single trials are .... just that.
I have had to add Teams to the clients cluttering up my systems, for dealing with officialdom. It is also lacklustre.
I refuse to use WhatsApp. Anyone wanting me in that sort of texting group has to use Signal. It's not yet clear to me which is the equivalent in the WebConf world. Incidentally I resent the dumbing down Signal is engaged in ....