> The managed (and for Mattermost even self-hosted) servers all hide features (such as message history, rich moderation tools, or support tickets) behind a payw

> The managed (and for Mattermost even self-hosted) servers all hide features (such as message history, rich moderation tools, or support tickets) behind a paywall. I know nothing about the other systems but this isn't true for Mattermost. We run Mattermost ourselves and it does indeed offer message history and moderation tools, they're part of the open source Mattermost version. I can't think of any feature that I miss from it, to be honest.