Last time I checked they cripple the self-hosted version, asking to subscribe for enterprise plan here and there. Source: deployed their chat locally a couple of weekends ago. Overall, I liked their Slack clone, they this one was a red flag to me. Now I’m not sure we want to deploy this, but I know very little alternatives. Zulip, but it cripples its self-hosted version too. It allows just 10 mobile users (notifications). Maybe Matrix it is then, but it’s not very suitable for airgapped company-wide deployment.