Github brings additional value that just being a DVCS - I manage all of my external consultants through it (assign work through issues, often review/approve PR'

Github brings additional value that just being a DVCS - I manage all of my external consultants through it (assign work through issues, often review/approve PR's via the UI, able to easily share a link to a specific line of code, easily share info via the wiki etc). There are obviously alternatives but the Github UI just makes it so easy to work with others.