[giancarlostoro]

Just note the license for Mattermost is AGPL or you pay them to free the code, only the compiled bits are MIT.

[pcthrowaway]

AGPL is also a free software license

[giancarlostoro]

Sure, but some employers forbid such licenses, AGPL is way more strict on making you share code than the GPL itself is. There's often libraries licensed under AGPL which could force a company to release all their backend code, which would be bad.

[Macacity]

But you are probably not integrating this into your own code, so it probably should not matter?