"For you" tab of GitHub is a worst. GitHub has been forced and withdrawn it repeatedly and is still waiting for an opportunity to force it. Eventually GitHub will delete the "Following" tab and force the "For you" tab again.
Tbh it's about as useful as the trending page is. Which is not very useful. These things could be so much better but GitHub is just copycatting at this point. It used to be a leader in great UX.