Comment by epistasis
Hopefully I'm not violating copyright by taking this small chunk of their LICENSE.txt, but this appears to be the language that some want clarified:
https://github.com/mattermost/mattermost/blob/master/LICENSE...
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You are licensed to use compiled versions of the Mattermost platform produced by Mattermost, Inc. under an MIT LICENSE
- See MIT-COMPILED-LICENSE.md included in compiled versions for details
You may be licensed to use source code to create compiled versions not produced by Mattermost, Inc. in one of two ways:
1. Under the Free Software Foundation’s GNU AGPL v3.0, subject to the exceptions outlined in this policy; or
2. Under a commercial license available from Mattermost, Inc. by contacting commercial@mattermost.com
"Subject to the exceptions" conflicts with the "no exceptions" wording in the GPL licenses, so I don't even see how any of this constitutes a valid license