I asked this question on Office Hours on the SIGGRAPH Wrap-Up show on Office Hours Global. Now answering question from @Paul Walhus:
[General Questions] Worldwide market share of video conferencing. Zoom 55%, Teams 21, Goto 13, Webex 9, RingCentral 6, Meet 5, facetime 3, skype 3, messenger .82%, bluejeans 0 any surprises in this list? (I was shocked about messenger so low)
Then while listening to the twit.tv network show “Windows Weekly they opened it up to questions from the audience and Special Forces Group Kaycee. “I was watching Office Hours yesterday . . . ”