There are end-to-end encrypted communications platforms. There are communications platforms with easily deployable security. There are enterprise-scale communications platforms. We believe that no current platform offers all of these. This is what Zoom plans to build
So how do you do that without the N^2 problem? I believe these multi-picture conference services do the video mixing in the central server to avoid that problem & make the video data feed to each participant just one picture. That requires the server to see the video (and audio), ergo no end-to-end security.
Trying to do it in each client would be 'interesting'.
Yes, it's probably a necessary PR thing.
PS Unicode superscript 2 (² in html) doesn't work.