History is strewn with chat apps that had their heyday and then died. It's a very dangerous business to be in. Slack is a total anomaly. Technically it's not v

History is strewn with chat apps that had their heyday and then died. It's a very dangerous business to be in. Slack is a total anomaly. Technically it's not very good considering the resources poured into it, but it has had a very outsized period of dominance.