Do you have a source for that information? One of the roles of Slack[0] is named "Member" not "Coworker".
> the author should have uncovered this cap before moving his community.
He tried: Slack said there was no limit, yet there was. Even Slack themselves mention starting with a "pilot team"[1] to demo; which wouldn't have discovered the limit either. How would you discover it?
[0] https://get.slack.help/hc/en-us/articles/201314026-Roles-and... [1] https://get.slack.help/hc/en-us/articles/217626298-Tips-for-...