It had been 'done' by IRC 20 years ago, Google had already been heavily in the space with their linking to Gmail and Hangouts and previous attempts with things

It had been 'done' by IRC 20 years ago, Google had already been heavily in the space with their linking to Gmail and Hangouts and previous attempts with things like Wave. Yet somehow Slack has come in and taken a massive share of the market in a matter of 5 years.