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Re:Story of Mattermost: Open-Sourced Competitor to Slack by teddyh on Tuesday December 17, 2019 @05:31PM (#21819651)
> This isn't really open source.

The usual term for it is “Open Core”, and is a legitimate, if frowned upon by many, practice:

https://en.wikipedia.org/wiki/Open-core_model

Re:Story of Mattermost: Open-Sourced Competitor to Slack by sneak on Tuesday December 17, 2019 @08:44PM (#21820994)
AFAIK, even the enterprise features of Mattermost are f/oss (agpl) and the license checks can simply be stubbed out if you don’t like them.