IMO this is a growing issue with the ubiquity of Github. Github is increasingly becoming a de facto resume, which is a problem for people who contribute to things that aren't on Github. This is also a problem for would-be Github contributors. As an example, Gitlab looks interesting, but I'd be concerned that potential employers would never spot my work there.

Well you can tell them this, right? The essential part is having some code out there in the open. I imagine if you host your projects on bit bucket it's OK too.

Though I agree that a lot of skilled people don't have the will/feel the need to build a public profile of their work.