What does it mean to “block” developers from accessing an open source repo? I can go to https://github.com/godotengine/godot and clone it without even making an account.
If someone's knowledge of software licenses and distributed version control is so limited that they can't figure out a way to bypass this "block," then I'm not sure they're cut out for the rigors of video game development.
A total tempest in a teapot.