What's more disturbing than the bug itself is the Mattermost team's response that this behavior is intentional for the free "team edition" of their software, and that "actually, I think the bug is that we should not be showing Channel Admin as a role in Team Edition" (i.e, users of the free edition don't get any kind of access controls, making it impractical to use outside a small group of trusted users).
Potentially controversial opinion: This isn't really open source. When major features like permissions and access controls are stripped from the "community" version of a software package, it starts looking more like a feature-limited demo.
Potentially controversial opinion: This isn't really open source. When major features like permissions and access controls are stripped from the "community" version of a software package, it starts looking more like a feature-limited demo.