You appear to have not read the article. The very first complaint is about the 10k message limit warnings. The author then complains "Slack would aggressively archive messages, sometimes only minutes after they were sent." He's lucky the messages even went through. He asked Slack for guarantees, after the fact, on the free plan with no intention of paying Slack's rates. Even the user limit problem is silly. It's called a team and marketed for internal use, not as something you 're-sell' or offer customers. It's obvious that putting your users on a single Slack team is not going to scale to tens of thousands of people, as soon as you start using Slack. My point here is that the author did not do his homework before he moved his thousands of users to Slack, and your point falls squarely under this lack of effort.