A good comparison that hasn't been mentioned much in this thread is Salesforce's Salesforce1 Fund, which launched with $100M in 2014 to encourage people to buil

A good comparison that hasn't been mentioned much in this thread is Salesforce's Salesforce1 Fund, which launched with $100M in 2014 to encourage people to build around the B2B app-creation platform it had launched a year earlier [0]. As the parent post mentions, it's important to make the case "compelling" for building best-in-class integrations with a relatively-recently-launched platform (whether or not that platform is sponsored by a historically huge corporation or not). It's an interesting point that bringing multiple sources of external capital to bear on an ecosystem via a multi-sponsor fund, rather than into the business itself via an IPO, allows the business to grow at a natural rate, and avoids Slack contributing to a "bubble" in which companies race to go public to launch their own platforms. I think we've learned from the last time around that the public markets aren't the best place to manage expectations in technology. As for why the sponsors made this investment, there's a very good case to be made that (a) efficient free-form communication within agile teams at small and large companies is a pattern as crucial to developing modern businesses as a CRM, and (b) Slack is perfectly poised to capture and hold this new market in the same way that Salesforce was. Certainly worth a $13mm commitment that's diversified amongst companies whose teams could still pivot should Slack not work out. [0] https://www.salesforce.com/company/news-press/press-releases/2014/09/140908.jsp https://www.salesforce.com/company/news-press/press-releases...