Big codebases tend to contain licensed code or at least depend on it, so you'd get code that's either illegal to publish or contains huge gaps. Getting it in a

Big codebases tend to contain licensed code or at least depend on it, so you'd get code that's either illegal to publish or contains huge gaps. Getting it in a state where you can put it on github, would require quite some dev and legal work, not likely to happen with abandonware.