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Mattermost is no longer Open-Source
(github.com)
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this post was submitted on 12 Feb 2026
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It isn't really Open Source if it can become not Open Source.
If you have some fos licensed software it will be foss forever, that licence is a contract and doesn't go away. Now the author(s) of that code can license it to other people or release the newer versions with a different non-foss licence.
Don't tell Oracle