I would be surprised if Slack disclosed publicly exactly which source code provider they used, but something hosted like Github EE sounds like a very reasonable

I would be surprised if Slack disclosed publicly exactly which source code provider they used, but something hosted like Github EE sounds like a very reasonable assumption given their response. Maybe someone was given a goal to migrate their main source code repo to a shared Salesforce instance for security or cross team integration reasons, and everything left on Github.com was just the stuff too unimportant to migrate. If so, seems like it payed off for them in this case.