And this kind of behaviour is a red flag for people who actually go digging through the GitHub profile. Like techical people in the last stages of a hiring process.

Is this aspirational or anecdotal, or is this what technical people in FANNG/tech actually do? I hope it's true but it strikes me as the kind of thing that most technical people involved in the interview process would be too tired/overworked to do.

I agree. As a technical person who has been involved in hiring, I never looked at github. My evaluation of a candidate was based on how he/she answered questions in the interview, and my general sense of "could I work with this person every day." I had no spare time to go beyond that.

> "could I work with this person every day."

Communication skills (or lack thereof) on PRs or issues they opened is something I try to look for if they provide a Github profile. Signs of a big ego that will likely get in the way of day-to-day work is the main thing I look out for and it's sadly not that uncommon.

Nobody ever has brought up my GitHub though I did use my private GitLab projects to land my first dev job.