> He behaved shittily by not honoring an informal contract.

Did he not honor the informal contract? What did he not honor?

If anything, Carl didn't honor the informal contract, he was the one saying Minecraft would promote his work, and no a name in a tiny credit is not doing that... but I'm feeling generous as let's be honest that's a bullshit clause that corporation always try to use that line without meaning much so it's to be expected.

Julian said he was never giving all its rights away. That was part of the informal contract. That's the thing that made him not sign it.