I had undocumented code, sloppy practices, never-ending forks with basically no real contributions. Using github account with this fraud data disqualifies such developers.

This sounds like every real project with more than 5 contributors that was ever written (probably including your own codebase). Also, forks for minor fixes is how minor fixes get done on GitHub. Yes, people do care about correcting typos, too.

Your bias and unfamiliarity with how GitHub works is blinding you to its value.

I prescreen developers for jobs very frequently, and if the developer supplies a GitHub link, I always check it. It can very quickly give me a rough idea of what to expect in the interview, including specific questions to ask about how the developer solved real problems in their real code.

Also, if you’re worried about “fraud data” — ask the developer to write some real code, live, while you watch. There’s no way to fake that.