Yes. I was sought and employed specifically because of the work visible on my Github profile from 2017 - 2019. My body of work on Github directly contributed to my candidacy for the job I currently hold.
Definitely possible. Could effect repos that are pinned, content of profile blurb on the left, etc. If I had access to where folks were coming from, I could gauge how visible or discoverable my profile was from other sources, my blog, etc.
