Walking Away from the Product I Spent a Year Building
Slack has a staying power that the author didn't catch: once you've got all kinds of apps reporting data directly into Slack, and all kinds of rooms set up  for specific  data purposes, it's even more sticky than email.Before a Slack-using company would switch, the competitor would need to support many/most/all of the integrations that the company is using. You've really only got two chances to win Slack's customers: the point before they seriously adopt Slack, and the point in the future where Slack does something stupid like jack prices way up or suffer a serious breach.