I rarely if ever come across a github repo from a search engine or from github's site. It's almost always linked from some module's info page, documentation, or some website that links to the repo. In that respect, it makes no difference to me if it's github, gitlab, or some random site.

Finding some random github repo is almost worse than nothing to me. without some third party indicator as to quality, it's not worth my time, because I don't have time to review and assess everything I come across, only the items that I have some indication actually do what I need and do it sufficiently.