I really don't and I am not aware of anyone at work who would. I rarely even read resumes and that if I am very mixed after the 1 hour coding/design/arch whatever round.

I never send my GitHub links either. If I am coding a side project and I think it has business potential I am unlikely to start with open source and if it doesn't have business potential, I wouldn't bother. Also if I am building something on the side, code is likely to be rushed and seemingly horrible.

I have no idea what in GitHub was written by the owner itself, what was copied, how long it took them etc.