> Yes not giving credit to you is a dick move, but it isn't a requirement of the license.
Actually, it IS a requirement of the MIT license: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
From what I understand, the person OP is referring to did not include the copyright notice, and provided zero attribution until pressed.
> This is just how open source works.
No, open source works because people believe that even if their work is being used for free, their contribution is recognized. People like who the OP is referring to chill that sentiment and do immense harm to the "open source" ethos.