It gets a bit more complex if you want to run your own server, but that's not something you can do at all with Slack.
It gets a bit more complex if you want to run your own server, but that's not something you can do at all with Slack.
For a small corporate team that wants to pilot a chat program, like in the original comment, the gulf between Slack setting up your own private workspace with a few clicks and a room that has all of your chat history exposed to any user that knows the room name is pretty large.
I would love to see riot or matrix give you a few click options to have them host your own private matrix server, as that's a big obstacle for corporate customers who don't have the resources (human) to spin up their own servers (domains, adding ssl certs, adding nginx, etc.) just for trialing a chat program.
Separately: we're working on providing a "one-click" homeserver hosting option with a free trial precisely of the kind you're asking for.