It sure does not. People are free to use whatever criteria they want for hiring. Even illegal ones would be impossible to prove as long as they are not advertis

It sure does not. People are free to use whatever criteria they want for hiring. Even illegal ones would be impossible to prove as long as they are not advertised. But neither this nor the fact that some companies outside the games use github as a criterion proves that credits are important. What you can do is important. What you have already done is too. Credits in movies and academia are an expression of these things. They are not in the games though.