Slack's product strategy is based on similar activities, which are things other companies do in the space you're playing in that you need to do too. For someone to switch from hip chat to slack, slack needed to be as good as hip chat in a whole bunch of dimensions. Stock did phenomenally well was built these unique activities, all the like interoperability,. Like, we've ours, we've our slack instance connected to all sorts of stuff monitoring - and that's hard to copy.