> But if I saw a re-creation of Slack or Gmail that is comprehensive and actually looks and feels like the real thing, and handles errors correctly, and handles

> But if I saw a re-creation of Slack or Gmail that is comprehensive and actually looks and feels like the real thing, and handles errors correctly, and handles off-line mode, and has the performance of the original and is open source I think many people would throw money at an open source Slack or Google.