Maybe some companies like the idea of you having a Github account (maps to "really into coding" on their candidate checklist) but don't have the time to actuall

Maybe some companies like the idea of you having a Github account (maps to "really into coding" on their candidate checklist) but don't have the time to actually evaluate the code that you've posted, due to having too many candidates/applications to sift through, etc. That could be one explanation...