As a developer or security researcher, you're able to download and run GitHub Enterprise Server. I'm not sure having access to the full source code makes a meaningful difference for most of GitHub's surface area, given it's largely Ruby.
LLMs can't really parse compiled code to find exploits, maybe code in scripting languages (python, js, etc) even if minified. So I don't quite agree with you, having access to the source can definitely help find exploits even in pre-LLM days.
Also, the Github enterprise code is "obfuscated" but it uses a trivially reversible method just meant to be a minor roadblock. After you get past that you get the full ruby source code, no minification or anything.
For a while the key was literally:
> This obfuscation is intended to discourage GitHub Enterprise customers from making modifications to the VM. We know this 'encryption' is easily broken.
describe is also the command you can use to edit the commit message of the change you're currently drafting. In jj there's no staging area, every modification to the working tree immediately gets integrated into the current commit. (This means if you have no diff in your working tree, you're actually on an empty commit.)
It was so much of a problem that at work we added a check that you were charging from the right ports to our internal doctor script (think like `brew doctor`).
I help out with an emulation community. Any time anyone with a 2019 MBP comes in with issues, I stop them from giving any more details and just have them check this first.