A job at LinkedIn in my area includes the following instruction statement:
Don't apply if you can't really write code and don't have a github profile. This is a job for an expert level coder.
I remember the simpler times when LWN authors fretted about the SourceForge monopoly capturing all FLOSS projects.
P.S. For the record, I do have a profile at Github. It is required in order to contribute to RDO, because it is the only way to login in their Gerrit and submit patches for review. Ironically, Fedora offers a single sign-on with FAS and RDO is a Red Hat sponsored project, but nope — it's easier to force contributors into Github.