https://www.cnbc.com/2019/04/18/zoom-ceo-eric-yuan-worth-3-billion-after-ipo-profile.html

Not even Eric Yuan's closest friends, oldest advisers and earliest investors thought Zoom needed to exist. It was 2011, and the market was littered with videoconferencing systems from Google, Skype, GoToMeeting and Cisco, where Yuan had been leading WebEx's engineering team.

"He came to a market that everybody said was done," said Dan Scheinman, Cisco's former head of corporate development who's now an angel investor and Zoom board member. "He was competing with free and some pretty big incumbents."