Earlier quoted context omitted.
A Github account, for one possible example.
Okay, I'll bite; what about a github account? You don't generally own code you write for an employer, so why would you be an personal repos from a company machine? (Likewise, there's generally no good reason for the company to have access to personal repos, so those security domains should never overlap)
I'm sure there are plenty of people who have access to their company's private repos through their personal GitHub accounts.