"The only way to make this go away is to pay slack's cheapest plan, which is $5 per user, per month. That's $5 x 12 months x 8,462 campers = $507,720 per year, just for our current campers. Until then, Slack aggressively archived messages, sometimes only minutes after they were sent." Do people really expect to receive full service and support for 8462 users for free? How can a company like Slack survive if it gives…
And that's just the thing. Most people will see Slack as IRC chat, but a bit better. And nobody will consider IRC chat worth $5 / user / month. Doubly so if your chat channel is open for everyone and you don't know who your users are.