Early people at Slack were nerds and unhappy with the communication tools that were available at the time. So they went the nerd way and hacked together someth

Early people at Slack were nerds and unhappy with the communication tools that were available at the time. So they went the nerd way and hacked together something they would not spend most of the time complaining about. "Hacked together" is important. It was not dedication, it was "scratching your own itch ". The hack was satisfactorily working. For them. And when Glitch failed, they were left with (among other things) their communication tool. "Someone" thought it was worth trying to market it, following the proverbial dogfooding strategy, because there was nothing else left to do anyway with Glitch. And boom. Slack. Source: memories of an article read many years ago that I can't find traces of, but was quite fascinating.