What profitability? I'm pretty sure GitHub is a loss leader to push people to Azure and cloud services. I also don't know anyone who actually uses GitHub as a social network even though it ostensibly has such features.
I should have said "will dent whatever profitability." I'm not sure it exists either. From the outside, it would seem crazy that it wouldn't be profitable with all the Enterprise stuff (and it's not like you can throw 10k engineers at whatever GH is doing).