Slack figured out its revenue stream a long time ago: charing companies who use it. They were making $200M in revenue over a year ago: https://www.businessins

Slack figured out its revenue stream a long time ago: charing companies who use it. They were making $200M in revenue over a year ago: https://www.businessinsider.com/slack-200-million-annual-recurring-revenue-2017-9 https://www.businessinsider.com/slack-200-million-annual-rec... I'd imagine that number is significantly greater today.