Sorry for the confusion, I mentioned Slack as an example as software that replaced something that was not defensible (Hipchat). It wasn't meant to be an example

Sorry for the confusion, I mentioned Slack as an example as software that replaced something that was not defensible (Hipchat). It wasn't meant to be an example for open source or container software. My mistake for not making that clear. That being said, I believe there will be a good open source version of Slack at some point. In fact, there is quite a number of people who do not want to move from Hipchat to Slack only because they need to deploy it within their own infrastructure because of compliance.